Sole material Rubber Outer material Cotton Closure type Pull-On Water resistance level Waterproof About this item WARM & COMFY - Skin-friendly mohair lining and soft featuring crochet cotton knitted upper provide comfortable and cozy wearing experience.You can wear this bootie slippers to bed in the winter to keep your feet toasty THERMAL & HIGHT HEEL - Unique design with high back heel to keep your ankle warm in this cold winter nights.The collar can folded and you can easy on or off boots slippers with a relaxed fit opening DURABLE & NON-SKID RUBBER SOLE - The platform sole is made of rubber outsole makes bootie slippers perfect for indoor or outdoor versatile.Each of your steps will become steadier with non-slip texture on the bottom and avoid sliding problem