The popular One K Defender helmet with the added sparkle of genuine Swarovski crystals. The Defender features a Chamude synthetic suede covered 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. 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. The Liners for One K are washable and used to change sizing between the different shell sizes. If you need a an XS order a Small and then an XS liner. XS, S & M all fit the smaller shell and L, XL and XXL fit the larger shell. The Black version also comes in an oval version, called long oval, to provide a better fit for some riders.