The One K helmet you've come to love with integrated MIPS technology, which is intended to add protection against rotational impacts to the head that could result from riding accidents at high speeds. A helmet is only safe, if it fits correctly. It is always better to be fit by a professional than it is to purchase a helmet on line. Matte polycarbonate and advanced ABS composite outer shell Injection molded shell design Incorporated MIPS technology Washable, quick-dry, moisture wicking, anti-microbial removable liner Stainless steel mesh Comfort padded harness with synthetic suede lining Two front, one back, and two center stripe vents Safety standards: certified to ASTM standards. One K MIPS Helmet