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 effectively reduce inner moisture buildup and exhaust moist air via the FXR Dry Vent™ System, A.C.M.T.™ keeps you dry and comfortable for long days on the mountain.