The North Face Women's Shellista II Mid Insulated Boot - TNF Black & Plum Kitten Grey - 7.5 Warm, waterproof mid-calf lace-up boot with a streamlined shell. Waterproof, BLC-compliant nubuck leather upper. Soft, oversized knit collar detail. Waterproof construction. Sole Unit: Women-specific, injection-molded, waterproof TPR shell Durable, TNF Winter Grip rubber outsole base with IcePick temperature-sensitive lugs Insulation traps hot air for reduced heat loss and increased warmth.