Super Mario Bros Mario and Luigi are back! Enjoy the warmth and comfort of these slippers, indoors and out! Perfect for any Nintendo, Super Mario, and Mario Bros fan! These slippers are comfortable, warm, and fun! Slippers range from kids Dual size 11/12, 13/1, 2/3, and 4/5. From heel to big toe, approximate measurements (in inches) are: size 11/12 (8.1 inches), size 13/1 (8.8 inches), size 2/3 (9.4 inches), and size 4/5 (10.1 inches). Perfect for kids ages 5 to 12. These Nintendo slippers are perfect holiday gift for any Super Mario fan! Soft plush material on the upper, with hard bottoms, a perfect slippers for outdoors too! Kids can enjoy these slippers before bed, in the house, or outside in the yard, playground, or school! 9-10 is a shoe size 9-10, fit is closer to size 10,typically for 4-5 year old 11-12 is a shoe size 11-12,fit closer to size 12, typically for a 5-6 year old 13-1 is a shoe size 13-1, fit closer to size 1- typically for a 6.5-7.5 year old 2-3 is a shoe size 2-3, closer to size 3- typically for 7.5-8.5 year old 4-5 is a shoe size 4-5, closer to a size 5 - typically for a 9 to 10 year old