The UGG Classic Ultra Mini Weather Hybrid Boot features waterproof suede with seam-sealed construction, a toggle closure with elastic lace to keep out slush and snow, a 17mm UGGplush™ lining and insole for warmth, a bio-based PU footbed, and a sugarcane EVA outsole with Spider Rubber® Pods for traction, designed for lightweight comfort and cold-weather performance down to -20°C.