Polartec Power Grid fabric has a smooth face for easy layering Fabric’s open-grid pattern provides superior warmth and breathability Spandex for stretch and ease of movement Self-fabric crew at collar with internal neck tape for comfort; locker loop for hang-drying Offset shoulder seams eliminate chafing under pack straps Full underarm gusset for range of motion and chafe-free comfort Elastic thumb loops for secure hand coverage Flatlock seams to minimize chafing; drop tail for increased coverage