Under Armour Men's UA Unchained Jacket ArmourStorm fabrication is 100% waterproof with fully taped seams, keeping you completely dry and protected 10,000mm/10,000g rating-which means it can withstand 10,000mm of rainfall in a 24-hour period Lightly textured, durable 2-layer nylon body with a polyurethane backing Smooth, embossed lining for next-to-skin comfort and easy layering Mesh-backed, underarm rib zips for strategic ventilation that don't hang up on the pit