Can be paired with any “shoe set” or “single pair” with removable sole! Extend the utility of your shoe set by utilizing Ozznek soles up to the next half size. Example; if you purchase a size 6 shoe set, you could add a size 6 or 6.5 shoe top and the soles will still fit perfectly for outdoor use. Add this boot to any of our shoes with removable soles for more variety and style. Machine washable and great for outdoor and indoor use- remove sole before throwing in the washer . Reattach sole when shoes are dry. Foot length measurements and size chart: Size 5 - 4 1/2- inches foot length Size 5.5 - 4 3/4 inches foot length Size 6 - 4 7/8 inches foot length Size 6.