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. Designed for Running. Skims your body:Sits below the waistband for moderate, everyday coverage. Thumbholes keep your sleeves in place. This fabric was treated with No-Stink Zinc to inhibit the growth of odour-causing bacteria.