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One K Defender Helmet

One K Defender Helmet


Why We Love This

Finally, a One K™ designed for children riders in Junior sizing, offering the same protection, quality and comfort as the current One K™ range, but with smaller internal helmet diameter, a thicker padded liner, and a smaller chin strap which is 15mm shorter in length than the adult sizes. Certified to ASTM standards.

Additional One K Helmet Liners also available!


CAUTION: Safety equipment must fit properly and be appropriately secured with manufacture approved parts only. Altering or adding to safety equipment voids warranty and can result in injury. As a safety precaution, inspect all products prior to each use.

For additional information on fit, watch our video on how to fit your helmet. Click Here!

Check out the other items we offer from One K helmets Here!

Polycarbonate and Advanced ABS Composite outer shell; injection molded shell design

Washable quick-dry, moisture wicking, anti-microbial liner; stainless steel mesh

Comfort padded harness with synthetic suede lining, hook & loop adjustment

Fastex buckle; two side, two front, one back, and two center stripe vents

One K™ Helmets boast the perfect synergy between advanced technology and aesthetically pleasing design. With enough features to appeal to those seeking everything a helmet could possibly offer, wrapped in a package that traditionalists can appreciate, One K™ has the best of both worlds

SEI/ASTM F1163.15

Key Specifications


Round : Yes

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