mens proton SL hoody

The lightest, most breathable option in our Insulation Collection, the Proton SL Hoody takes the guesswork out of warming up on cold climbs and other high-output activities in cool conditions. The knit insulation holds its loft and shape-no matter how often you stuff it into the bottom of your pack. More importantly, it allows your body to breathe, so you're not left a sweaty mess after you have to step on the gas to get through the crux.