The OneK Defender Air riding hats boast PAS015 certified to ASTM standards. The hats feature genuine Swarovski crystals and are the most adjustable around due to the OneK revolutionary air pump system which provides ultimate comfort and a bespoke fit. The 3 air pockets at the back of 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 this is helped by the multiple air vents. With enough features to appeal to those