Patagonia R1 Ultralight Half-Zip The Patagonia R1 Ultralight Half-Zip is a lightweight, breathable fleece built for moving fast in the mountains. Its lofty, breathable construction provides comfortable warmth without feeling bulky, while the smooth outer face layers easily under a shell or harness. At just 8.47 oz (240 g), it&';s an easy choice for climbing, hiking, backpacking, and other high-output adventures where every ounce counts. The deep center-front half-zip makes it easy to dump heat on steep climbs and gives you enough room to pull the layer on or off without removing your helmet. A unique single-panel sleeve construction keeps seams off your shoulders, making it more comfortable under a backpack, while the slim fit provides unrestricted mobility. Two vertical chest pockets keep a phone, snacks, topo, or other small essentials close at hand without adding unnecessary bulk. Low-profile cuffs provide full wrist coverage and can be pushed up over your forearms when you need to cool down, while the longer hem stays tucked under a harness. Made with 100% recycled polyester and produced in a Fair Trade Certified(TM) factory, the R1 Ultralight Half-Zip is a versatile mountain layer for anyone who wants breathable warmth without the weight. Features Lightweight, breathable fleece for high-output activities Smooth outer face layers easily under shells and other layers Deep center-front half-zip for ventilation and easy on/off Single-panel sleeve construction keeps seams off shoulders under a pack Two vertical chest pockets for snacks, phone, topo, and small essentials Low-profile cuffs with full wrist coverage Longer hem stays tucked under a climbing harness Slim fit for mobility and easy layering Made with 100% recycled polyester Fair Trade Certified(TM) factory Specs Weight: 8.47 oz (240 g) Fabric: 4.6-oz 100% recycled polyester flat-faced double knit Made in Vietnam Fair Trade Certified(TM) sewn