The Brake Free fits helmet sizes XS to XXL, matte and gloss finish, full face, 3/4 and half helmets. We fit-tested Brake Free on race helmets, street helmets, touring helmets, adventure helmets, modular helmets, and even some skateboard and bike helmets.  Helmets that require XL Mount All models of Ruroc Atlas Sedici Strada II Icon Airform Helmets that do NOT work with Brake Free Bell Star helmets Shark Modular - EVO1 Strength and Steel SS1600 AGV K5S Sena Outrush and Outrush R Send us a message through the red chat box at the bottom of the page if you'd like us to verify your specific helmet. Or contact us via email.