The angled topline offers a more comfortable fit around the calf while the extended rubber upper offers additional protection. This boot will be a classic for years to come. It features 5mm CR Flex-Foam for comfort and stability, a breathable Airmesh Lining, and extended rubber coverage for extra protection. The boot also boasts an angled topline, Achilles reinforcement, and an aggressive waffle high traction outsole. CR Flex-Foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing. Upper is made of Rubber/Neoprene, the lining is Breathable Airmesh, and the sole is Rubber. Care instructions recommend cleaning with cold water and using rubber boot care products. Heel Height: 2.0 cm.