These fuzzy feet-warmers are made of soft and insulating 7.6-oz 100% polyester (85% recycled) double-faced Synchilla fleece; the ankle cuffs feature an elasticized, two-snap entry to secure the fit, and a third layer of fleece that pads the soles for extra warmth. Nylon facing reinforces the heel. Grippy anti-skid fabric helps prevent side-slips and spinouts. Recyclable through the Common Threads Recycling Program.