Next to skin comfortable as a heavier baselayer or airy as a featherweight sweater the Patagonia R1 Air Women's Zip-Neck is a versatile piece in a lightweight, breathable, technical fleece fabric. 5.7-oz 100% recycled polyester jacquard fleece with hollow-core yarns knit into a zigzag pattern with a half zip neckline for cozy up-to-the-chin comfort, or deep venting when you’re heating up. A great piece for year around use, this is a go-to cold weather warmer because it is built to keep your core dry while providing heat trapping loft against the chill. We particularly like that you can layer this over a baselayer for a featherweight layer when you just need a little extra warmth under a parka but not a full insulator, or as an après exercise cool down top that’s comfortable and easy care for a wash and wear technical fleece you’ll find yourself reaching for all year ‘round.