ChezMax Women's Slim Fit Lined Top & Bottom Thermal Underwear Set Black Medium 2 pieces fleece thermal set (top & bottom) Light, soft, comfortable, enhanced Thermal underwear compare with existing thermal underwear Shell: 94% Cotton / 6% Spandex; Connecting Layer: 95% Polyester (bamboo fiber included), 5% Wool; Lining: 100% Polyester. The inside fleece lining will gently hug your body for thermal retention, elastic wrist & ankle cuffs prevent chilling Machine Wash Casual design, suitable for daily wear and outdoor activities in winter,great to be worn alone at home or be an extra warm layer under other clothes