The Coldpruf Men's Extreme Performance Expedition Weight Zip Mock Shirt has been specifically engineered with Coldpruf Technology CTF for warmth, dryness, and odor control, with spandex for superior fit. Two layer fabric construction traps air between the layers providing a natural barrier of warmth. The Extreme Performance Expedition Weight Zip Mock is designed for wear in very cold to extreme cold temperatures during medium to high activity. Inside and outside layers 96% CTF performance polyester, 4% spandex. Two layer fabric construction helps provide a natural barrier of warmth. Coldpruf Technical fiber CTF fabric delivers superior wicking and moisture management to keep you dry and comfortable. CTF contains Alpha Scan antimicrobial to keep the garment essentially odor free. 4% spandex provides comfortable close to body fit. Extra long front zipper for easy on and off. Zipper guard at top of neck to prevent chafing. Drop tail construction for better fit. Rib cuffs. Flatlock construction on all seams. Tagless for additional comfort. Excellent thermal qualities in very cold to extreme cold weather conditions with medium to high activity. Avg. weight: 9 oz. Import.