Spandex and Nylon shorts with washable sequins to make up the zebra design. These shorts are very comfortable because the fabric is a heavy legging fabric! Can't keep them in stock! Believe me these are the most comfortable shorts. Just got them in and are flying off the shelf. The fabric is like a heavy legging but will stretch to fit. The youth OSFM will fit comfortably up to 60 lbs and about a girls size 10-12. The junior OSFM should fit up to 90 lbs. The "new" Adult size should fit up to 120 lbs . 92% Nylon/ 8% Spandex