Woolly Aussie Foot Warmers are made of pure Australian fleecy wool which keeps your feet warm and comfortable yet allows them to breathe. Keep clean with a 40 Degree Celsius Hand or Machine Wash in Wool Detergent and leave to dry in the Shade. Sizing Guide: Small - Ladies 5 to 6 Medium - Ladies 7 to 8 Large - Ladies 9 to 10 / Mens 7 to 8 Extra Large - Mens 9 to 10