MODULAR BRIM SYSTEM: Oakley's Modular Brim System (MBS) is the leading feature on all Oakley Snow helmets. No matter the size or shape of your Oakley snow goggle, it will have a perfect fit with the new Oakley snow helmets. Two brims are included with each helmet: a LARGE FIT for larger goggles, and a SMALL FIT for smaller goggles.