NanoPro microporous coating technology provides waterproof, windproof protection with dynamic air permeability-the more you move the more air is exchanged for enhanced breathability (43% more breathable than previous coating). Updated with Marmot's NanoPro technology, the PreCip Jacket offers superb waterproof, windproof protection with unsurpassed breathability. Lightweight and easy to pack, this is must-have gear for backcountry and urban travelers alike.