evo.com | Pearl Izumi Jackets > The truth is waterproof breathable membranes can get easily overloaded by sweat and heat, rendering them less useful for high-output activities like cycling. The Pearl Izumi Summit PRO Barrier Jacket is simpler, with a single polyester layer that's been treated with a DWR finish. It's very packable, lightweight, and perfect for cooler days on the bike. Save your membrane money! 100% Polyester with DWR Finish Zippered Chest Pocket Packable Rear Access Pocket Hidden Integrated Strap for On-Bike Storage Standard Fit | Pearl Izumi Summit PRO Barrier Jacket 2022 - Small in Blue | Polyester