The new 11K helmet is designed with overall safety as a top priority.  Designed to absorb the high impact hits, as well as adjust 360 degrees to your uniquely shaped head, it's Reebok's lightest helmet without sacrificing fit or impact absorption.   Next generation aerodynamic shell with ventilation designed for a low-profile fit EPP Flexible liner with comfort cushions contours to the unique shape of your head The Microdial II permits 360 degree wrap and vertical adjustment to alleviate pressure points and hold helmet firmly in place Features fit clips that permit easy tool-less length adjustment Using carbon fiber technology in the subshell allows for a lightweight helmet without sacrificing protection