Feature-rich mountain bike helmet. Cutting edge safety featuring the MIPS safety liner integrated with the impact absorbing EPS padding. MIPS stands for Multi-directional Impact Protection System, which is a leading slip-plane technology inside the helmet designed to reduce rotational forces that can result from certain impacts. Lightweight and highly-ventilated for maximum air flow to keep you cool. Magnetic Fidlock buckle for simple latching and unlatching. Removable washable moisture wicking comfort liner. The MSR MT1 w/MIPS Helmet is a premium mountain bike helmet with top-of-the-line features. With MIPS impact protection, a fidlock buckle, adjustable fitment, and a lightweight EPS shell.