Ballet shoes should fit snugly enough to stay on securely during pirouettes and leaps, yet allow for flexibility and freedom of movement. The length should be such that there is a small amount of space between the big toe and the end of the shoe, about a thumb’s width. The width should be snug but not constricting, allowing for slight arch support and preventing blisters. The elastic should fit securely without digging into the skin, keeping the shoe in place.