DetailsMarmot Men's Size Chart The lightweight Aerobise Anorak offers a fresh, fun take on the iconic hiking pullover with all the performance features you need when the summit you spot turns out to be a false peak. Unique AirExchange fabric construction and technology provides advanced air permeability and enhanced drying time, so you stay cool and comfortable. Hit the trails on sunny days with confidence: the moisture-wicking stretch fabric will pull away the sweat and the UPF 25 rating will block the sun's harmful rays. The snap placket and 3-piece hood offer versatility as conditions change. Bold colorblocking and fun prints make it easy to go from the trail and back into town, or you can stow the lightweight, packable anorak into your pack.