Rugged, waterproof winter boots with heavy duty (400 g) PrimaLoft® insulation and temperature-sensitive soles for superior traction. Extremely durable, warm and waterproof winter boots Lightweight ThermoBall™ powered by PrimaLoft® insulation retains warmth when wet Waterproof, ballistic-mesh upper with welded-TPU overlays for added protection Waterproof, full-grain leather mudguard Plush leather collar for superior comfort and warmth Industry-leading OrthoLite® footbed for long-lasting comfort Lightweight, injection-molded, ground-contact EVA midsole/sole IcePick® temperature-sensitive rubber lugs for increased traction