Our mission We make boots to fit your calf. DuoBoots has been democratising calf-fit and ankle boots since 1974. All our boots are available in nine foot sizes and eight calf sizes. Our boots We are the only company in the world to offer our entire collection of calf-fit boots in seven calf sizes and nine shoe sizes. Our ankle boots are available in both standard and wide fit. That’s a total of 63 sizes in our calf-fit boots and 18 sizes in our ankle boots.