Snoozies are not a sock and not a slipper, it is a cross between the two, making them a foot covering or Footie!! Made of 100% Polyester. Snoozies includes white soft fleece lining inside, overall print on the out side and non skid sole on the bottom. (This way you won't slip on the hardwood or tile floors) Machine wash cold. Tumble dry low heat. No bleach. Sizes run as follows: Small (5-6), Medium (7-8), Large (9-10) and X-Large (11-12).