The One K CSS with MIPS Helmet features a matte Polycarbonate and Advanced ABS Composite outer shell, an injection molded shell design, a washable quick-dry, moisture wicking, anti-microbial liner, stainless steel mesh, a comfort padded harness with synthetic suede lining, hook and loop adjustment, and Fastex buckle, and two front, one back, and two center stripe vents. One K Helmets boast the perfect synergy between advanced technology and aesthetically pleasing design. Certified to ASTM standards and complete with a regular/round shape to help fit heads which are almost identical in measurements front to back and side to side. Matte Polycarbonate and advances ABS composite outer shell Washable, quick-dry, moisture wicking, anti-microbial liner Stainless steel mesh Comfort padded harness with a synthetic suede lining, hook and loop adjustment and Fastex buckle Two front, one back, and two center vents Regular/round shape