Product details:

The One K Defender Chrome Stripe Helmet features a matte Polycarbonate and Advanced ABS Composite outer shell, injection molded shell design, washable quick-dry, moisture wicking and anti-microbial liner, stainless steel mesh, comfort padded harness with synthetic suede lining, hook & loop adjustment, and Fastex buckle; two side, two front, one back, and two center stripe vents. New to the United States, 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. Certified to ASTM and CE EN standards.6 1/2) Large 57-58cm (7 1/8
7 1/4) Small 53-54 cm (6 5/8
6 3/4) XLarge 59-60cm (7 3/8
7 1/2) Medium 55-56 cm (6 7/8