100% Waterproof. Fully lined with 5mm neoprene for flexibility. Breathable air mesh lining. Easy to clean rubber overlay. Durable, quick cleaning outsole. Triple toe reinforcement. Quadruple rubber heel reinforcement. Reinforced arch support. Steel shank for structural support. Adjustable calf gusset extends up to 7 cm. Estimated boot height 41cm. Estimated max calf circumference 49cm. Ref: UTFS6370