The moisture-wicking Kids' Capilene Midweight Crew is made of 100% recycled polyester fabric that has hollow-core yarns and a diamond-grid back to trap warm air and speed dry time. We've added HeiQ Fresh durable odor control to the fabric to keep things fresh. The crewneck baselayer top has self-fabric binding at collar with internal neck tape for comfort and a locker loop for hang-drying. Raglan sleeves provide mobility and comfort under pack straps. Thumb holes at sleeve openings for secure hand coverage. Forward-set, flatlock seams provide a great fit and minimize chafing; low-bulk construction allows easy layering under midlayers and outerwear. Drop-tail hem provides additional rear coverage. Hand-me-down ID label. Fair Trade Certified sewn.