High/low grid interior (Polartec® Power Grid® polyester) is key to this hoodie's light weight, breathability and versatility Fabric stretches, traps heat and compresses to practically nothing Superstretchy grid fabric along the side panels, in the hood and at the harness line enhances mobility for high-output use Minimalist, deep-venting front zipper allows for further temperature regulation, with a soft zipper garage to keep your chin comfy Off-shoulder seams sit comfortably under your pack straps Sleeves push up easily when it's hot, but have discreet on-seam thumbholes for added warmth when it's cold HeiQ® Pure odor control Exterior left-chest pocket with Slim Zip, zipper garage and mesh pocket bag Snug-fitting, low-profile, balaclava-style hood fits comfortably under a helmet strap