Product descriptionPatagonia say - The Nano-Air® Light Vest was made to be worn for the entirety of your aerobic, start-stop mountain activities, so you’re never slowed down by having to change layers. Stretchy and breathable FullRange™ insulation dumps excess heat when you’re working hard and keeps you warm when you’re not. Made in a Fair Trade Certified™ factory.Stretchy, Breathable Fabric - The 100% recycled polyester ripstop shell and lining fabric offer mechanical stretch, exceptional breathability and improved abrasion resistance, with a durable water repellent (DWR) finish made without perfluorinated chemicals (PFCs/PFAS) to resist light moisture; the microtexture keeps fabric from sticking to the skin for versatile comfortFullRange™ Insulation - 40-gram FullRange™ 100% polyester (93% recycled) insulation delivers outstanding mechanical stretch and air permeability (35 CFM), allowing excess heat to move away from the bodyBuilt for Mobility - Articulated patterning and strategically placed, low-profile quilting combined with stretchy fabric and insulation provide an exceptional range of motion for unhindered movementZipper with Garage - Center-front zipper has a zipper garage at the chin for next-to-skin comfortPocket Details - Two handwarmer pockets and single chest pocket are zippered, low profile and low bulk to wear comfortably with a harness or a pack; self-stuffs into the chest pocketLow-Bulk Design - Cleanly finished armholes and hem are low bulk and keep things simpleSupporting The People Who Made This Product - Made in a Fair Trade Certified™ factory, which means the people who made this product earned a premium for their laborCountry of Origin - Made in Vietnam.Weight - 170g Patagonia W's Nano-Air Light Vest