MIPS Brain Protection System. The Boa® system lets riders easily secure and adjust helmet fit with one hand. The in-mould composite skeleton increases helmet integrity for larger vent variations. Soft, comfortable, moisture-wicking and washable helmet pads. Internal, recessed channels move airflow over your head to stay cool and dry. Removable snap-on visor and port covers provide multiple looks to fit your style. LockDown dividers make helmet strap management clean and are easy to adjust. The Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership.