Featuring eVent's air-permeable waterproof membrane, the EMS Air Flow Jacket lets sweat out regardless of the weather or your activity level. Lightweight, amazingly breathable and hydrophobic, eVent allows sweat to evaporate immediately, rather than after the lining gets damp. Sweat evaporates faster, rain stays out, and you stay drier.
"eVent fabric is the most breathable waterproof material we've ever worn." Backpacker Magazine