LaCrosse® ZXT Over-the-Shoe Rubber Boots Outperforming others in test for tear strength, ozone deterioration, buckle pull-out, tensile strength and abrasion resistance, ZXT Over-the-Shoe Rubber Boots keep workers' feet warm and dry. They're 100% waterproof, constructed of a rubber compound that remains flexible and durable, even in cold working conditions. An aggressive abrasion resistant rubber outsole provides slip resistance in most conditions. Boots fit size for size over most steel toe work boots, making a good fit easy to find. Defined heels increase stability on ladder rungs, and highly reflective 3M® heel labels enhance worker visibility in low-light conditions.