To achieve the best fit for your new Cabooties, we recommend carefully measuring before you make your purchase. For the best results, stand on a piece of white paper and carefully mark the end of the longest toe and back of the heel. Measure the distance between these marks and add a half inch. Use this length to select your size you'll need from the appropriate size chart below (scroll down to find our adult sizing). If you are between sizes, we recommend choosing the larger size.