These socks are designed for indoor use. Great for cold floors at work or people who always have cold feet. The non binding cuff and softness make them a very comfortable sock. Also good for diabetics or others with poor circulation. 43% alpaca, 43% acrylic, 8% nylon, 8% elastic. Machine wash cold. Tumble Dry Low. Made in Peru. Black is not shown in pictures. These socks are sized as follows: Small(child/small adult). Medium(Ladies/Mens shoe 6-8). Large(Ladies/Mens shoe 8-1/2 to 10-1/2). XLarge(Mens shoe 11 and up).