It’s a slipper – it’s a puppet: on your foot – it’s a slipper. On your hand – it’s a puppet. Stretchy knit collar: keeps little feet warm and toasty. Officially licensed: officially licensed slippers from Sesame Street. Foam footbed for cushion: foam footbed cushions every step. Sizes: small is approximately size 9/10, the right size for a typical 4 to 5-year-old. Med (11/12, 5-6 yo); large (13/1, 6-7 yo); x-large (2/3, 7-8 yo)