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

Internal organization has been optimized for travel purposes and rugged compressions straps keep your carry tight and stable whether you're bringing your whole kit along or slimming down for excursions

Drop into banked corners

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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.