A microfleece baselayer for low-bulk, highly breathable warmth in cold conditions. The interior grid works with your other layers to efficiently trap body heat and move sweat during high output, with HeiQA(R) Mint odor control for freshness. PolartecA(R) Power GridA(R) Fabric PolartecA(R) Power GridA(R) fabric with HeiQA(R) Mint odor control has a smooth face for easy layering and a lofted back for added warmth Zip-Neck Silhouette Deep front zipper vents body heat, with low-bulk construction and internal neck tape for comfort next to skin; a locker loop offers easy hang drying Raglan Sleeves Raglan sleeves for comfort and mobility Underarm Gussets and Low-Bulk Seams Full underarm gussets and low-bulk seams for range of motion and chafe-free comfort Low-Profile Thumb Loops Thumb loops offer secure hand coverage Weight 173 g (6.1 oz) Fitted for Optimal Wicking Fits next-to-skin without being compressive for optimal wicking, easy layering and freedom of movement