Treat leg ulcers and speed up healing with rolls of McKesson Unna Boot bandage. The soft cotton wrap fits easily and securely around the legs. The gauze in the McKesson unna boot contains a non-hardening paste combining soothing calamine and nourishing zinc oxide. These work together to keep the ulcer moist and help it heal more quickly.A vacuum-sealed pouch preserves the paste's moisture and offers easy opening. Single-use and disposable.. It's also free of preservatives and latex for the safety of sensitive and delicate skin.