Material Composition: 30% Nylon, 30% Acrylic, 20% Cupro, 15% Polyester, 5% Polyurethane Care Instructions: Machine Washable Closure Type: Pull On Neck Style: Crew Neck Size: XL Gunze, Hot Magic Ladies' 8-sleeve innerwear. This "Never Cold" series of underwear is recommended for cold winters, featuring "warm moisture absorption and heat generation," "warm fleece lining," and "fluffy thick fabric." The fleece lining material is soft and fluffy against the skin. It uses moisture-absorbing and heat-generating material, making it less prone to stuffiness and comfortable. It is stretchy and extends well, so it's easy to move in despite being thick. You can spend active days even on cold days. This one piece provides warmth equivalent to 5 pieces of regular cotton underwear. It is a thick innerwear with high heat retention.