This pair of Boot Socks by Carhartt is made out of acrylic, wool, nylon and polyester. Features include a contoured fit throughout, odor protection, flat toe seams and reinforced heel & toe providing you with maximum comfort and stability. These socks are built for cold weather and regulate temperature while evaporating moisture. Available in M (shoe sizes 5-10) L (6-12) & XL (11-15)