DAIWA Danrotech Socks Black Free Size (Short) DS-3122R

Far infrared rays warm up cold feet DANROTECH DANROTECH uses your own body heat to keep you warm. Humans emit heat called "far infrared rays." This is not the heat that is transmitted when the skin touches you directly, but the heat that you can feel even without touching, and it's warmth like a fireplace. The fabric absorbs the far infrared rays emitted from your body and reflects them back. This keeps you from getting too hot and keeps you at a comfortable temperature.