ColdPruf Women's Platinum Base Layer Long Sleeve Shirt - The Platinum offers the desired level of warmth and comfort in very cold to extremely cold weather during mid to high activity. Nature's natural warmth fiber, Merino Wool, blended with polyester on the outside and combined with ColdPruf Performance Polyester on the inside provides maximum warmth, dryness and comfort at the same time providing odor control. 2 Layer Flat Seamed Hemmed Cuffs Tagless Wicks & Evaporates Moisture Antimicrobial Performance Polyester Inside/Merino Wool Outside Style: 55AP