The Coldpruf Men's Tall Platinum Midweight Crew Shirt is a two layer garment, specifically engineered with Coldpruf Technology CPT and merino wool to trap air between the layers of fabric to provide a natural barrier of warmth. The Men's Tall Platinum Midweight Crew Shirt is designed to provide warmth and comfort in very cold to extremely cold weather during mid to high activity. Two layer construction. Inner layer is 100% CPT performance polyester. Outer layer is 30% Merino wool, 70% CPT performance polyester. Coldpruf Technology CPT fabric is engineered to provide superior wicking and moisture movement to keep you dry and comfortable. CPT contains Alpha Scan, an antimicrobial that helps to keep the garment essentially odor free. Two layer construction provides a natural barrier of warmth. Drop tail construction for better fit. Tail is 2 inches longer than regular size. Sleeve length is 1.5 inches longer than regular sizes. Rib cuffs. Flatlock construction on all seams. Tagless for additional comfort. Excellent thermal qualities in a variety of weather from very cold to extremely cold. Avg. weight: 6.5 oz. Import.