Technology :The only reason you know you're wearing this featherlight jacket is the protection you get from wind and rain. How? Mini-ripstop, a protective fabric that weighs just 29g per square meter ("lightweight" tees usually start at 160g). So nothing holds you back – whatever the weather. Material :Fully windproof and water-resistant, you can run, hike and cycle through gales and light rain without feeling the chill. Ventilated underarms keep you airy and dry as you work up a sweat. And it's made from recycled polyamide. Works for the planet, works for you. Design :Zero by name, zero by nature. Folding away into the tiniest of pockets, it's easy to pack – 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. Weight :61 g