Just as at home on the road or the trail the helium jacket offers excellent waterproof protection in a highly packable formatif it looks like theres a chance of a heaver shower makes sure you have a helium jacket in your back pocket the lightweight 25 layer fabric has impressive waterproofing and breathability stats to keep you dry from both within and without the jacket comes with its own stuff sack to tidily pack it away into a size thatll stuff into a rear jersey pocket when not in use