From The North Face, the Women's Nuptse Traction Booties feature: Polyester ripstop upper 700 fill down certified to the Responsible Down Standard Slipper-style fit Pull on design Has TNF™ DNA design elements including iconic colorblocking, puffy quilting and bold branding IcePick® temperature-sensitive rubber lugs for increased traction Reengineered outsole has an updated lug shape for better traction Approx. 12.66 oz./359 g weight Imported.