One K Defender Jr Suede Helmet Finally, a One K for smaller riders. Now in Junior sizing, the Defender Jr Suede Helmet offer 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, shorter by 15mm in length than the adult sizes. 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. Features: Chambude synthetic suede covered Polycarbonate 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 strip vents ASTM certified