Heel Height: Approx. 14'' Tall. Ozone-resistant, abrasion-resistant rubber offers 100% waterproof protection. ZXT rubber is a premium compound of rubber that has a high tensile strength, which means greater tear-resistance and greater durability. Chevron cleated outsole provides superior traction. Top strapbuckles for an adjustable, secure fit. Designed to protect boots and feet in muddy conditions, these overshoes fit size for size over leather work boots and are made of ZXT, a premium rubber compound with high tensile strength for tear resistance and durability.