Make the best of a rainy day in the Festival boot by Hunter. Vulcanized natural rubber construction. Quick dry knitted nylon lining. Multi-layer cushioned sponge insole. Traditional calendered natural rubber sole. The brand advises that a white wax film may appear on the surface of the rubber boots and that it can be wiped off with a damp cloth. This "blooming" effect is not a defect. Blooming is caused when the boots are exposed to extreme temperatures or temperature swings and the wax helps prevent the rubber from weathering.