M's Proton SL Hoody Size:L hollow fibers enable the microfilter

hollow fibers enable the microfilter to filter water faster than traditional filter media

and a best-in-class Vibram outsole

Sounds a single ding

Fully crushable for packability

offer enhanced stability and lightweight performance

M's Proton SL Hoody Size:L hollow fibers enable the microfilterThe 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 shapeno matter how often you stuff it into the bottom of your pack. More importantly, it allows your body to breathe, so youre not left a sweaty mess after you have to step on the gas to get through the crux.