Made from recyclable SEBS rubber, which in turn comes in part from Bioplastic. Free from PVC. Guaranteed free of fluorocarbons. Molded in one piece. Light on the foot and durable. Equipped with extendable and replaceable lining in warming wool blend. Easy to jump in and out of. A good complement when the weather is cold, wet, and sloppy. Machine washable at 30 °.