Super thick fleece interior for maximum warmth and comfort. Non-skid bottoms to prevent slipping and sliding: Silicon rubber grips on soles of socks prevent slips and falls on smooth floors. 100% Polyester. One size fits most. Feels soft and comfortable throughout, sure to catch the eye and appeal of others. Great gift for Valentine's Day. This timeless design is a very popular choice for Valentine's Day. Machine wash. Tumble dry low.