These LaCrosse 18in. Burly Rubber Kneeboots are made of ozone-resistant and scent-free natural rubber for 100% waterproof protection. Adjustable ankle straps provide a secure fit and the Ankle-Fit design prevents slippage while walking. Wool-felt midsoles give insulating protection and removable EVA footbeds provide cushioning comfort. Traction comes from the self-cleaning Chevron-cleated outsoles that won't track mud or dirt. These are great boots for messy environments.