Sorel Women's Caribou Winter Boots - Rated to -40 below zero, the Caribou is the timeless choice for work and play in cold weather. Nubuck leather upper and handcrafted vulcanized rubber shell are seam-sealed for complete waterproofness and lined with a removable 9mm ThermoPlus felt InnerBoot Thick rubber midsole insulates the boot from cold ground Sorel AeroTrac non-loading outsole provides sure footing Sherpa Pile snow cuff 2.5mm bonded felt frost plug Style: NL1005