MIPS Brain Protection System. The Boa® system lets riders easily secure and adjust helmet fit with one hand. Internal, recessed channels move airflow over your head to stay cool and dry. 37.5® fit pads pull moisture away from your skin to help maintain ideal comfort. Sunglass port allows easy access to securely store glasses when not in use. LockDown dividers provide clean looks and easily adjustable helmet strap management. Includes removable NeoVisor for all the benefits of a cycling cap without extra bulk. The Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership.