This arm warmer uses DANTORU, a high-grade moisturizing fiber that does not lose body heat. The palm part is designed to be loose and roomy, so it can be used unisex. The wrist part is well-fitted with ribbed knitting that warms the wrist well. About DANTORU The polyvinyl chloride contained in the material is extremely high in heat retention compared to cotton and wool, and is a high-grade thermal fiber that keeps you warm without letting the body heat trapped inside. It also has excellent quick-drying properties and does not contain moisture. Since sweat and moisture do not accumulate inside, it prevents sweat from getting cold and keeps you comfortable. *Since this is a product with good stretchability, there may be some individual differences in size. Please note that the color may transfer or change color to other objects due to friction when sunburned, sweat or water wet. Due to the nature of the material, fluffing and pilling may occur. In addition, washing with water may cause shrinkage, color fading, fluffing, etc., and the texture may change. When washing, put it in a net and press it to wash, and do not wash it with other items. Do not use detergents containing optical brighteners or bleach. Do not leave it in water for a long time or leave it wet. We use fibers that are sensitive to heat. Never dry clean or tumble dry. Also, keep it away from drying with warm air such as heating or anything that causes high temperatures, such as hand warmers. (If the thread shrinks due to high temperature, it will shrink and will not grow back.)