The jacket ($135) weighs only 11 oz., and you can crumple it into a ball the size of a softball. It’s waterproof and windproof, nice to have on a chilly day in the spring or fall. The jacket is highly breathable, but if things get really heated up, large pocket zippers vent heat from the core, and pit zips vent heat from under your arms. www.atlantisweathergear.com