Use these mules for various outdoor activities like hiking, camping, etc. Ideal for men who love exploring the outdoors. Upper is 100% recycled P.E.T. fleece, sole unit has 20% recycled rubber, non-PFC DWR finish, lightweight ThermoBall Eco insulation retains warmth when wet, oso fleece collar lining, collapsible heel with elastic side gore panels for easy on/off.