The Zero Jacket from On is zero by name, zero by nature. The only reason you'll know you're wearing this featherlight jacket is the protection you'll be getting from the wind and rain. Folding away into the tiniest of pockets, it's easy to stow whether you're trail running, hitting the gym or need an extra layer for a late night jog. The reflective On logo on the elbows keeps you visible to passers-by long after the sun's set, and ventilated underarms keep you airy and dry as you work up a sweat. If that's not enough, it's also made from recycled polyamide. Works for the planet, works for you.