Crescent Moon Neoprene Overbooties Small Fits Women's size 6-9.5/ Men's size -up to 8.5., Large fits Women's size 10 - 14/Men's size 9 - 12 Over-shoe and boot protection keeps your feet warm and dry all day Thick 6 mm neoprene stretches to fit over running shoes and hiking boots Adjustable closure for tight or lose fitting around your ankle