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Adults

$154.95 - $189.95
Proven MIPS Coverage for Superior Open-Face Performance The Speedframe MIPS Helmet has premium features usually meant for much more expensive helmets. A MIPS liner, goggle compatible 3-position visor, and our 360-degree fit make the Speedframe one of the best values in an open-face helmet. Add in the legendary aggressive Fox design DNA, and you have one of the most shred-ready trail helmets in the market today. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Removable, washable moisture-wicking comfort liner - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3-position adjustable visor - 360 Fit System allows you to dial in your perfect fit every ride - Weight: 360g Sizing - Small = 51 – 55cm - Medium = 55 – 59cm - Large = 59 – 63cm Certifications - CPSC - EN 1078 - AS/NZS 2063
$214.95 - $244.95
Key Features: - Mips® equipped - Virginia Tech 5-Star helmet rating - Goggle-compatible, 3-position visor - 360° Fit System to dial in fit - Fast and simple FIDLOCK magnetic buckle Performance-focused open-face trail helmet The Speedframe Pro Blocked Helmet earned Virginia Tech's best rating (5 STARS) in its Bicycle Helmet Ratings program. Designed with input from our pro mountain bike athletes, this top-tier open-face mountain bike helmet offers a market-leading feature set. Specifications: - Mips® added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Dual-density Varizorb™ EPS provides improved protection by spreading forces of impact across a wider area - FIDLOCK SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2® liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle-compatible, 3-position adjustable visor - 360° Fit System allows you to dial in your perfect fit every ride
$214.95 - $239.95
Performance-focused open-face trail helmet - MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Dual-density Varizorb EPS provides improved protection by spreading forces of impact across a wider area - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3 position adjustable visor - 360°Fit System allows you to dial in your perfect fit every ride - EPS, PC, PA, Polyester
$214.95
MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Dual-density Varizorb EPS provides improved protection by spreading forces of impact across a wider area - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3 position adjustable visor - 360°Fit System allows you to dial in your perfect fit every ride
$214.95 - $244.95
Performance-Focused Open-Face Trail Helmet The Speedframe Pro Helmet has earned Virginia Tech's best rating (5 STARS) in its Bicycle Helmet Ratings program. Designed with input from our pro mountain bike athletes, this top-tier open-face trail helmet offers a market-leading feature set including MIPS, an easily adjustable multi-position visor, and a 360-degree fit system. The pro version is equipped with a Varizorb dual-density EPS liner, Fidlock SNAP helmet buckle, and an XT2 antimicrobial comfort liner. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Varizorb Dual-density Varizorb EPS - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3-position adjustable visor - 360 Fit System allows you to dial in your perfect fit every ride - Weight: 380g Sizing - Small = 51 – 55cm - Medium = 55 – 59cm - Large = 59 – 63cm Certifications - CPSC - EN 1078 - AS/NZS 2063
$154.95 - $189.95
- Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3 position adjustable visor - Removable, washable moisture wicking liner - 360°Fit System allows you to dial in your perfect fit every ride
$49.99 $114.99 57% Off
Electra has always brought you the styles and functional designs you love in the world of cruisers. Now, with their Solid Color Helmet, they keep you looking stylish while keeping your dome safe. This understated, savvy lid offers a variety of sweet color choices to meet your style needs. - Durable ABS hardshell and EPS foam liner max comfort and protection - Fit retention system with reflective bubble decal - Solid color to match any bike. Well, at least your favorite bike. - Secure magnetic Fidlock buckle - Heat sealed and washable padding liner for added comfort - Reflective straps - CPSC Adult Certified Size: - Small: 48-54cm - Medium: 55-58cm - Large: 59-61cm
$144.99 - $165.99
- Compass fit - 11 vents with increased air flow - Compatible with click-mount light - Lightweight - Integrated brim - Lay flat strap dividers - Compression molded pads - Light & durable dual shell - Snowsport knit compatible - Average weight: 390g(mips) - MIPS: multi-directional impact protection system
$74.99 - $89.99
At home on the dirt or in the streets, the Bell Local blends classic skate style looks with new-school comfort and technology. The re-tuned shape fits closer and looks smaller, and the Local adds a cycling-style Fit System to a street helmet for a more secure fit. Hit the pump track, shred some vert, or rock it while you’re riding around town. For comfort and style, keep it Local.
$139.99 - $149.99
Adaptable for whatever adventure you're planning, the Spark 2 MIPS is an all-rounder helmet with an adjustable visor that lets you tackle the trail with confidence. Trail Bound Curiosity is best fed on two wheels. The Spark 2 MIPS is designed to scratch that itch to get outside, connect a new loop, or find fun singletrack right in your backyard. The updated ventilated shell shape and internal Sweat Guide keeps your head cool, while the Ergo Fit system plus Integrated MIPS keep your confidence and comfort in check. With an adjustable visor, block the sun during casual family outings on the weekend or add a pair of goggles for longer solo laps on your local trail system. No matter the adventure, the Spark 2 MIPS is an all-rounder helmet ready to tackle the next trail. [Availability, certification, color, and pricing may vary per region. If outside of the USA, please check with your authorized local dealer for more information.] - INTEGRATED MIPS—Integrated MIPS (Multi-Directional Impact Protection System) is designed to reduce rotational forces that can result from certain impacts. By integrating the MIPS slip plane into the retention system, we are able to reduce complexity and weight for a compact, better ventilated helmet that fits more closely to the head. - ERGO FIT—A lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments (integrated with MIPS). - ADJUSTABLE VISOR—Adjustable visor allows for sun protection and easy goggle storage. - NO-TWIST TRI-GLIDES—Quick-adjust fasteners that help keep straps flat and properly positioned - SWEAT GUIDE—Sweat Guide pad design pulls moisture away from the brow pad and away from eyewear. - GOGGLE GRIPPER—Rubber grip on the back of the helmet keeps your goggle strap in place. Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older
$150.00
The ideal companion on all-mountain and trail rides, the Trail Evo provides all-round protection with patented inmould technology due to direct fusion of the helmet shell to the internal EPS material. The numerous ventilation openings have been strategically angled and positioned to offer superior air circulation and a continuous cooling system. Precision interlocking "ErgoFit Ultra" allows you to adjust the fitting ring both vertically and circumference-wise, guaranteeing a precise and comfortable fit for any head. With the "QuickRelease" visor system, the visor can quickly detach in the event of a crash, preventing further damage or breakage both to the rider and visor. - Inmould technology, external and internal ventilation channels - Adjustable visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable straps - EN1078, CPSC, KC Sizing: - X-Small = 49 – 54cm - Small/Medium = 54 – 58cm - Medium/Large = 58 – 62cm
$199.99
The ideal companion on all-mountain and trail rides, the Trail Evo provides all-round protection with patented inmould technology due to direct fusion of the helmet shell to the internal EPS material. The numerous ventilation openings have been strategically angled and positioned to offer superior air circulation and a continuous cooling system. Precision interlocking "ErgoFit Ultra" allows you to adjust the fitting ring both vertically and circumference-wise, guaranteeing a precise and comfortable fit for any head. With the "QuickRelease" visor system, the visor can quickly detach in the event of a crash, preventing further damage or breakage both to the rider and visor. - MIPS Brain Protection System - Inmould technology, external and internal ventilation channels - Adjustable visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable straps - EN1078, CPSC, KC
$199.99
The ideal companion on all-mountain and trail rides, the Trail Evo provides all-round protection with patented inmould technology due to direct fusion of the helmet shell to the internal EPS material. The numerous ventilation openings have been strategically angled and positioned to offer superior air circulation and a continuous cooling system. Precision interlocking "ErgoFit Ultra" allows you to adjust the fitting ring both vertically and circumference-wise, guaranteeing a precise and comfortable fit for any head. With the "QuickRelease" visor system, the visor can quickly detach in the event of a crash, preventing further damage or breakage both to the rider and visor. - MIPS Brain Protection System - Inmould technology, external and internal ventilation channels - Adjustable visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable straps - EN1078, CPSC, KC
$150.00
The ideal companion on all-mountain and trail rides, the Trail Evo provides all-round protection with patented inmould technology due to direct fusion of the helmet shell to the internal EPS material. The numerous ventilation openings have been strategically angled and positioned to offer superior air circulation and a continuous cooling system. Precision interlocking "ErgoFit Ultra" allows you to adjust the fitting ring both vertically and circumference-wise, guaranteeing a precise and comfortable fit for any head. With the "QuickRelease" visor system, the visor can quickly detach in the event of a crash, preventing further damage or breakage both to the rider and visor. - Inmould technology, external and internal ventilation channels - Adjustable visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable straps - EN1078, CPSC, KC
$120.00
The classic half shell open-face helmet and therefore ideal companion for trail & XC tours. The Trail XC provides all-round protection with Inmould technology in which the helmet is directly connected with the absorbing EPS material. The high number of ventilation openings, as well as the placement angles and integrated channels, provide lots of air circulation and a great cooling system. The adjustment unit with precision interlocking, ErgoFit Ultra creates a comfortable and precise fit both vertically and horizontally, guaranteeing a good fit and a high degree of wearing comfort. The visor is removable and the lining is washable. - Inmould technology, external and internal ventilation channels - Removable visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360=deg; Inmould shell - Adjustable straps - EN1078, CPSC, KC Sizing: - X-Small = 49 – 54cm - Small/Medium = 54 – 58cm - Medium/Large = 58 – 62cm - X-Large Wide = 58 – 62cm
$199.99
All-Mountain and Trail helmet. The high-end in-mold construction and its large and integrated venting system provide highest safety level and best comfort. The 3-level visor adjustment accommodates goggles and preferred positioning, and its magnetic closure system provides easy handling. Trigger AM Fulfills European and US safety standards. - Double In-mold Shell Technology - External And Internal Ventilation Channels - Goggle Compatible Adjustable Visor - Precision Interlocking - Ergofit Ultra System For Horizontal And Vertical Adjustment - Magnetic Closure - En1078, CPSC, KC - +/- 350g Sizing - Small/Medium = 54 – 58cm - Medium/Large = 58 – 62cm
$249.99
One of the lightest (+/- 595g) all-mountain, trail and enduro full face helmets designed for all day comfort regardless of your riding discipline. The Trigger helmet provides all-round protection with patented inmould technology due to direct fusion of the helmet shell to the internal EPS material. Additionally, the Trigger FF is the only helmet on the market with the unique and patented technology of one complete and seamless EPS liner unit, with inclusion of the face guard structure. As a result, the rider benefits from increased structural strength, reduced weight & volume, and increased ventilation. The numerous ventilation openings have been strategically angled and positioned to offer superior air circulation and supply a continuous cooling system. Precision interlocking ErgoFit Ultra allows you to adjust the fitting ring both for verticle tilt and circumference-wise, guaranteeing a precise and comfortable fit for any head. With the 2-level visor adjustment capability, there is sufficient space to rest your google along the forehead yet below the visor. Lastly, the Fidlock magnetic buckle makes for a quick, efficient closure and release without compromising security. This helmet series fulfils the European safety standard, EN1078 as well as the American CPSC and AS for DH on frontal impact. - MIPS brain protection system - Patented all-in-one Inmould technology, external and internal ventilation channels - Adjustable, goggle compatible visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable straps - Magnetic closure - +/- 595g (SM) - EN1078, CPSC, KC, AS - Sizes: XS = 49-54cm, SM = 54-58cm, ML = 58-62cm head circumference
$300.00 - $309.99
Extremely lightweight (+/- 600g) All-Mountain, Trail and Enduro all purpose/all day full face helmet. The Trigger helmet provides all round protection with patented inmould technology in which the helmet shell is directly connected with the absorbing EPS material. The unique and patented technology connects the face guard in one piece with the head EPS liner and therefore combines the whole in one resulting in an increase of its structural strength with the advantage of a reduction of weight & volume but an increase in ventilation. The high number of ventilation openings, as well as the placement angles and integrated channels provide lots of air circulation and the best cooling. The two-components adjustment unit with precision interlocking, "ErgoFit Ultra" creates a comfortable and extremely exact fit vertically and horizontally, guaranteeing a good fit and a high degree of wearing comfort. The 2-level visor adjustment allow to rest goggle and adjust visor to preferred position and its magnetic closure system provides an easy handling. This helmet series fulfils the European safety standard, EN1078 as well as the American CPSC and AS for DH on frontal impact. - Patented whole-in-one Inmould technology, external and internal ventilation channels - Goggle compatible adjustable visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable jaws/straps - Magnetic closure - +/- 600g (SM), 660g (ML) - EN1078, CPSC, KC, AS - Material composition: 20% Polycarbonate, 45% EPS, 0.5% Aluminium, 20% Nylon, 2% POM, 7.5% PP, 5% Polyester Sizing - Small/Medium = 54 – 58cm - Medium/Large = 58 – 62cm
$359.99
One of the lightest (+/- 595g) all-mountain, trail and enduro full face helmets designed for all day comfort regardless of your riding discipline. The Trigger helmet provides all-round protection with patented inmould technology due to direct fusion of the helmet shell to the internal EPS material. Additionally, the Trigger FF is the only helmet on the market with the unique and patented technology of one complete and seamless EPS liner unit, with inclusion of the face guard structure. As a result, the rider benefits from increased structural strength, reduced weight & volume, and increased ventilation. The numerous ventilation openings have been strategically angled and positioned to offer superior air circulation and supply a continuous cooling system. Precision interlocking ErgoFit Ultra allows you to adjust the fitting ring both for verticle tilt and circumference-wise, guaranteeing a precise and comfortable fit for any head. With the 2-level visor adjustment capability, there is sufficient space to rest your google along the forehead yet below the visor. Lastly, the Fidlock magnetic buckle makes for a quick, efficient closure and release without compromising security. This helmet series fulfils the European safety standard, EN1078 as well as the American CPSC and AS for DH on frontal impact. - MIPS brain protection system - Patented all-in-one Inmould technology, external and internal ventilation channels - Adjustable, goggle compatible visor - Dial adjuster with precision interlocking - ErgoFit Ultra system for horizontal and vertical adjustment - Double-Inmould, 360° Inmould shell - Adjustable straps - Magnetic closure - +/- 595g (SM) - EN1078, CPSC, KC, AS - Sizes: XS = 49-54cm, SM = 54-58cm, ML = 58-62cm head circumference
$219.99 - $220.00
The XACT full face helmet is designed for racers and bike park enthusiasts riding rugged terrain. The integrated Vortex ventilation channels guarantee continuous air circulation and the the specific shape of the helmet adds strength and durability. The ergonomic padding system provides a high degree of comfort. Ergonomically shaped cheek pads enhance comfort without compromising fit, and integration of the EPR (Emergency Padding Release) system provides the option to quickly remove the cheeks pads in the event of a rescue emergency. The XACT helmet series fulfills the European safety standard, EN1078 as well as the American CPSC and AS for DH. - ABS helmet shell for impact absorption in the event of a crash - Vortex ventilation system with integrated air channels - EPR emergency padding release - Adjustable visor - Washable padding - Double-D safety closing - EN1078, CPSC, AS, KC Sizing - X-Small = 49 – 52cm - Small/Medium = 53 – 56cm - Medium/Large = 57 – 59cm - Large/X-Large = 60 – 62cm
$389.99
The Xult DH full-face helmet is designed for racers and bike park enthusiasts riding rough and demanding terrain. Due to integrated Vortex ventilation channels, this helmet proves to be extremely breathable because of the continuous air circulation. The FRP (fibre reinforced polymer) shell requires less material, decreasing weight and volume yet without compromising durability. Risk of brain injury from the effects of rotational forces is thus dramatically reduced because of the lightweight shell as well as the integration of Xmatter/Xrail technology which absorbs impact and promotes multi-directional movement. The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit. - FRP reinforced helmet shell - Vortex ventilation system with integrated air channels - Xmatter/Xrail impact absorption liner - adjustable visor - Washable padding - Double-D safety closure - EN1078, CPSC, AS
$139.99
A stylish road helmet with advanced WaveCel technology that balances comfort and performance for all riders who value safety. A MAJOR ADVANCEMENT IN THE PROTECTION AGAINST CYCLING-RELATED HEAD INJURIES Starvos WaveCel is a versatile, high-value cycling helmet for new-to-seasoned riders who want WaveCel, a leading technology in the protection against cycling-related head injuries. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Trek-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. PRODUCT DETAILS - WaveCel advanced helmet technology - Intuitive, one-handed Headmaster fit system makes adjustments easy - LockDown dividers make helmet strap management clean and easy to adjust - Soft, comfortable, and moisture-wicking washable helmet pads - Available in XS and XL sizing - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership - Complies with U.S. CPSC safety standards for bicycle helmets for persons age 1 and over
$139.99
A stylish road helmet with WaveCel technology designed for riders who prioritize safety and require a fit designed for a rounder head. - WaveCel advanced helmet technology - Intuitive, one-handed Headmaster fit system makes height and circumference adjustments easy - LockDown dividers make helmet strap management clean and easy to adjust - Soft, comfortable, and moisture-wicking washable helmet pads - Round fit sizing designed to accommodate rounder head shapes - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership
$399.99
An all-around, road racing helmet that is light, cool, fast, and features the added protection of Mips. Light is fast. Fast is cool. Velocis Mips is now lighter, cooler, and faster than ever thanks to insight and feedback from Trek-Segafredo. And with a full suite of pro-level features, this helmet is bound for the podium. Velocis is designed with protection front and center. This helmet earned a Virginia Tech 5-STAR safety rating and features a Mips Air safety system. Product details: - Trek's lightest road helmet is now even lighter, saving grams and providing more comfort - Improved ventilation and channeling keeps you cooler and moves you faster - The Mips Air system is light, cool, and designed to improve comfort and protection - The single-lace BOA® fit system is fully adjustable to provide a custom, 360° fit - Rubberized sunglasses docking port provides secure and easy-to-use storage - Beveled front edge improves field of view while riding in the drops and on the hoods - 5-STAR Virginia Tech safety rating - Complies with U.S. CPSC safety standards for bicycle helmets for persons age 1 and over Trek Velocis Mips – Light, fast, cool Designed to meet the everyday demands of Trek-Segafredo, Velocis is a versatile helmet that excels anywhere you ride. It’s lighter, cooler, and faster than ever before and, with added tech like the Mips Air safety system, a customizable BOA® fit system, and secure sunglasses storage, you’ll be ready for an epic day in the mountains or chasing local KOMs.
$69.99
Safety & Style. Protection With Panache. - Built-in rear safety light - In-mold construction - CPSC certified - Easily adjustable straps - Removable visor - Easy-to-adjust fit system - Integrated bug net - Vent count: 12 - Weight: 300 grams - Sizes: S/M 54-58cm, L/XL 58-62cm
$69.99
The Serfas Metro features clean modern style with large cooling vents, forward-facing sun visor, Posi-Fit adjustment dial, and integrated rear-facing LED safety light paired with high-visibility reflective silver accents. - Built-In Rear Safety Light - In-Mold Construction - CPSC Certified (Consumer Product Safety Commission) - Easy Adjustable Straps - Removable Visor - Posi-Fit Dial Adjustment System - Integrated Bug Net: - Weight: 300 Grams - Vent count: 12 - Sizes: S/M 54-58cm, L/XL 58-62cm
$89.99
The Serfas Kilowatt is E-Bike certified and features adjustable venting which be can be opened or closed depending on how much air flow you want, also a built-in rear LED safety light for added visibility with additional reflective design accents, and an easy-to-adjust fit system. - Tested and Certified to NTA 8776 E-Bike Helmet Standards - Adjustable Top Vents (Slide Open/Close) - Built-In Rear Light - Rear-Facing Reflective Accents - Adjustable Straps - Easy-To-Adjust Fit System (Rear Knob) - Weight: 484 Grams - Vent Count: 8 - Sizes: S/M (54-58cm), L/XL (58-61cm)
$79.99
The Serfas Incline Enduro is designed with lots of ventilation (18 vents) to help keep air flowing and make sure you stay nice and cool. In-mold construction provides strong impact protection while adjustable straps and rear easy-to-adjust fit system knob makes sure your helmet stays properly snug. - Enduro Fit - In-Mold Construction - Adjustable Straps - Removable Visor - Easy-To-Adjust Fit System (Rear Knob) - Integrated Bug Net - Vent Count: 18
$214.99
- COB LED Technology: it's a more compact footprint while delivering a higher intensity of light, meaning you'll be seen from further away and gives the lights a more uniform look - The helmet will be equipped with 98 COB LEDs in total - Front Light (30 COB LED diodes) - Rear Lights with Turn Signals (34 red COB LED diodes, 34 orange COB LED diodes) - 1100mAh rechargeable battery providing up to 10 hours with the lights set on maximum brightness - USB-C Charging Connection (Chargeable with a 5V—5.2V & 0.5A charger) - Remote included for turn Signal - Option to buy a Lumos Remote to activate Automated Brake Lights. (The Remote Lite included with Ultra doesn't come with an accelerometer and can only be used to activate turn signals) - Lumos Companion App: Customize your light flashing patterns, check your battery life, track your activity, and sync with Strava and Apple Health - Maximum Venting - MIPS technology Sizing: - Small: 51 – 55cm / 20 – 21.6" - Medium/Large: 54 – 61cm / 21.3 – 24" - X-Large: 61 – 65cm / 24 – 25.6"
$230.00
Giro's Advantage 2 was honed to perfection in the heat of elite competition. It’s an amazingly sleek ProTour-proven time trial helmet with all the protection of your everyday-riding lid so you’ll shave precious seconds, or even more, off your personal best! Plus, it does it all with the awesome fit of Giro's Roc Loc 5 retention system and it weighs an amazingly svelte 11 ounces. - Small = 51-55cm - Medium = 55-59cm - Large = 59-63cm