Warm, Comfortable Fabric Polartec® Power Grid® fabric with HeiQ® Pure odor control has a smooth face for easy layering; fabric’s open-grid pattern next to skin provides superior warmth, breathability and moisture-wicking performance; Fair Trade Certified™ sewn Self-Fabric Zip-Neck Self-fabric backing on collar with internal neck tape for comfort; locker loop for hang drying Offset Shoulder Seams Offset shoulder seams eliminate chafing under pack straps Deep Center-Front Zipper Long center-front zipper vents body heat and is backed by kissing welts for low-bulk comfort next to skin Motion-Friendly Underarm Gussets Full underarm gussets for range of motion and chafe-free comfort Low-Profile Thumb Loops Elastic thumb loops for secure hand coverage Flatlock Seam Construction