100% Pure Silk Underwear. Natural, pure white, glossy, soft, incredibly light and warm. All Terramar Thermasilks come with the EC2 Qwik-Dri Electrostatic process which has the ability to actually lift the moisture molecules away from the body and break them down for rapid evaporation. Since the EC2 Qwik-Dri process alters the molecular signature of the yarn in the fabric, the moisture control is permanent. It won't wash out or wear off.