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 for a comfortable and stable foundation, Breathable Airmesh Lining, Extended Rubber Coverage for extra protection, an Angled Topline for a better calf fit, Achilles Reinforcement for durability, and an Aggressive Waffle High Traction Outsole for superior grip. The CR Flex-Foam adjusts to your foot's contours, resisting blisters and chafing. Upper: Rubber/Neoprene; Lining: Breathable Airmesh; Sole: Rubber. Care Instructions: Clean with cold water and use rubber boot care. Heel Height: 2.0 cm.