The A.C.M.T.™ system is not only engineered to be fully waterproof, but also to combat the unique breathability and condensation challenges faced by snowmobilers in sub-freezing temperatures. Designed to reduce inner moisture buildup in a similar way to a dual goggle lens, and exhaust moist air via the FXR Dry Vent™ System, A.C.M.T.™ keeps you dry and comfortable for long days in any type of riding.