The Defender Air riding hats boast PAS015 certified to ASTM standards. The hats feature genuine Swarovski crystals to help you stand out from the crowd. The hat is the most adjustable around perfect for all shape heads and has a revolutionary air pump system which provides ultimate comfort and a bespoke fit. The 3 hidden air pockets in the liner are inflated by pressing its concealed air pump until you get the fit you want. The quick dry liner is moisture wicking and anti-microbial this is helped by the multiple air vents. The Defender features a matte Polycarbonate and Advanced ABS Composite outer shell; injection moulded shell 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. All OneK Defender hats comes with slots compatible with the magnetically-attached click in sun visor perfect on sunny days to protect your eyes from UV rays and dust particles when protection is needed most.