Reflects your own body heat, keeping you warm in any weather. Made of aluminized threads woven into a knit fabric that is soft to the touch. Thin enough to wear underneath regular socks, durable enough to wear alone. Incredible lightweight and flexible material keeps the temperature just right. Perfect Indoors and Outdoors: walking, running, inside the house, shoveling snow, daily activities and much more! Machine washable & dryer safe. Great for men, women, and children. Set of 2 Pairs. Available in 2 sizes: SMALL/MEDIUM and LARGE. Color: BLACK.