Western Mountaineering Down Booties - Unisex Blue Extra Large. The nylon shell is treated with a DWR to protect the insulation from external moisture and the rand is made of a durable coated nylon fabric. An elastic heel band positioned inside the booties helps lock in the heat and provide lateral stability for walking. The bottom of the booties feature a non-slip Toughtek material to keep you from slipping. Specifications for Western Mountaineering Down Booties - Unisex: Manufacturer: Western Mountaineering Gender: Unisex Age Group: Adults Fabric/Material: Downproof Nylon with DWR Weight: 6 oz Insulation: 800-fill Goose Down Outsole Material: Toughtek Outer Sole Material Features of Western Mountaineering Down Booties - Unisex: made in specialized factories Average total weight only 6 ounces per pair 800 fill power European goose down insulation Durable downproof nylon outer shell fabric with durable water repellent finish Non-slip Toughtek outer sole material Durable foam insole with superior thermal insulation Internal elastic heel strap for maximum warmth and stability Waterproof and durable rand material Adjustable elastic draw closure Color options: Sky Blue Navy Blue or Yellow Package Contents: Western Mountaineering Down Booties - Unisex Western Mountaineering DNBTXLNV: Down Booties - Unisex Blue Extra Large