Our leo now with long sleeves for the cooler weather! Made out of cotton spandex fabric. Features: * Scoop back * Fabric strap across the the back for extra security * Snap buttons for easy diaper changes * 95% cotton 5% spandex Sizing and fit: Leos run true to size to larger. Order child's current size. Please size up if your child is at the end of a size range, and expect a small amount of shrinkage when washed and dried.