Rouched Francie moto boots made for a larger calf. Expandable gussets allow for stretch and secure fit at the top of calf. Triangle gusset on inside of shaft next to YKK zipper as well as 4 elastic faux button gusset detail on outside of calf. Approximate circumference expandable up to 17". Shaft measures 16". These fit me perfectly at women's clothing size 14/16. Size 10M. Worn only once, in excellent condition. *also available in brown in my closet*