One K Defender Matte Helmet features a Matte finish outer shell and coordinating tonal matte front venting, washable, moisture wicking and anti-microbial liner, stainless steel mesh and a comfort padded harness. The One K is ideal for a variety of disciplines boasting 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! Product Details: Matte 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, and Fastex buckle. Two side, two front, one back, and two center stripe vents. Certified to ASTM standards. Helmet Shapes: Regular/Round – Is shaped for a head which has almost identical front-to-back and side-to-side measurements. Long Oval – Is shaped for a head which is longer front-to-back (from forehead to the back of the skull) than it is side-to-side (ear to ear).