ColdPruf Women's Authentic Dual Layer Long Sleeve Crew Neck Base Layer Top 100% Cotton Inside, 65% Cotton/25% Merino Wool/10% Nylon Imported Two-layer engineering with Merino Wool, traps body heat between layers, resulting in chill-blocking warmth Tagless labeling and flat seems provide a smooth fit and extra comfort Off-white with hemmed cuffs Fits loose on the body, generous cut for full range of motion Perfect as a base layer or on its own. Best for dressing with minimal layers in very cold to extreme cold weather and low to medium activity levels