THE NORTH FACE Nuptse Down Mule Nuptse Down Mule from the classic Nuptse series. The upper uses recycled polyester with a water-repellent finish, and is filled with 550 fill power down. The footbed lining is fleece, comfortable to wear even with bare feet. The outsole uses 40% recycled rubber, which is environmentally friendly. It's a design that's easy to use both indoors and outdoors. Brand new, not for sale. Instant purchase OK.