Warm on the inside to keep you going outside. Powered by seamless technology, this soft, sweat-wicking layer has a cozy interior to help keep you warm during chilly outdoor runs. Skip-the-Chafe, Seamless Construction Minimal seams to reduce chafe Sweat-wicking Four-way stretch Cozy and warm Thumbholes keep your sleeves in place This fabric was treated with No-Stink Zinc™ to inhibit the growth of odour-causing bacteria no flaws