The Dropframe Pro Kairos Helmet is a game-changing, open-faced 3/4 enduro helmet. It features Mips®, the BOA® Fit System for excellent fit and security, increased ventilation, plus an Ionic+® antimicrobial liner and cheek pads to optimize fit. With its increased coverage for the ears, jaw, and back of the head, this MTB helmet provides the most complete coverage we offer in an open-face helmet.