Duofold Women's Light Weight Thermatrix Performance Thermal Shirt 92% Polyester, 8% Spandex Imported Machine Wash Quick drying vapor technology evaporates moisture fast Excellent moisture management Thumbholes for added hand warmth Raglan sleeves and super soft stitching help avoid irritation Thermatrix 3d textured matrix fabric pattern that wicks moisture and creates small air pockets that retain body heat