Proton SL Hoody Men's lid The optionally available lithium packs

The optionally available lithium packs are simply attached to the wrist area using snaps

And it’s all wrapped up in a unique Kate Zessel design you might almost want to frame—although

Made from recycled PET plastic bottles

a 100% Polyurethane palm

With modern styling and a casual fit

Proton SL Hoody Men's lid The optionally available lithium packsThe 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. What's been