The Coldpruf Men's Performance Single Layer Crew is constructed of 96% Coldpruf Technical Fibers and 4% spandex for superior fit, warmth, dryness and odor control. The garment is designed to give a comfortable next to body fit without being restrictive. Coldpruf Performance is excellent to wear in cold to very cold weather, with medium to high activity levels. Constructed of 96% Coldpruf Technical Fibers CTF and 4% spandex. Single layer fabric provides extraordinary mid weight warmth and comfort. CTF delivers excellent moisture management and evaporation. CTF features Antimicrobial AlphaSan by Milliken to keep your garment looking great and essentially odor free. Drop tail construction for a better fit. Flat lock construction on all seams. Self fabric cuffs. Tagless label for additional comfort. Assembled in Mexico of USA made components.