Thank you for viewing. This Heattech Extra T-shirt will support your winter outfits while keeping you comfortable. Made of waffle material, it can be worn as an inner layer or as an outer layer. It has been worn about 5 times and washed. I am selling it to someone who doesn't mind the wear and tear, so please refrain from purchasing if you are sensitive to such things. 【About Function and Material】 - It has a heat retention function that prevents heat from escaping, so you can wear it warmly even in cold weather. - It uses moisture-absorbing and heat-generating material that absorbs water vapor evaporating from the body and generates heat. - It is made of stretchy material, so it is easy to move in and provides an optimal fit. Material Body: 66% cotton, 32% polyester, 2% polyurethane, Ribbing: 94% cotton, 6% polyurethane Care Machine wash Dark colors may fade, so please wash them separately from other items. Use detergent without fluorescent whitening agents for off-white and light-colored items. Avoid using a dryer after washing with water. Due to the nature of the material, this product is prone to pilling (formation of lint balls). If pilling occurs, do not try to pull it off; instead, remove each one with small scissors. Use a laundry net. Thank you.