Once you put these on you'll be ready to play outdoors or in. Extra cushioning in the toe and heel ensures daily comfort. Anatomical Flex Fit system reduces bunching of material underneath feet. Y heel pockets provide a better and more flexible fit. Material: 60% Merino wool/35% nylon/3% Lycra spandex/2% polyester. Washing Instructions: Machine wash warm inside out with no bleach; tumble dry low or air dry. Product measurements were taken using size S (Women's 4-6). Please note that measurements may vary by size.