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. Key features include 5mm CR Flex-Foam, a breathable Airmesh Lining, extended rubber coverage, an angled topline, Achilles reinforcement, and an aggressive waffle high traction outsole. The CR Flex-Foam adjusts to the unique contours of your foot, creating a comfortable and stable foundation while resisting blisters and chafing. Upper is made of Rubber/Neoprene, lining is Breathable Airmesh, and the sole is Rubber. Care instructions recommend cleaning with cold water and using rubber boot care. Heel Height: 2.0 cm.