Plain Burgundy Strappy Wool Slippers Warm, lightweight, and comfortable wool slippers. Anthracite wool felt upper and thick wool felt insole. Bordeaux cotton strap on the instep. The rubber sole allows for outdoor use. Upper and interior in eco-produced wool felt in an R-W-S certified workshop. Color - ANTHRACITE Unisex slippers Available in sizes 36/37 to 46/47. R-W-S: Responsible Wool Standard