Supple leather upper. Vamp cut hugs the foot without restricting movement. Silicon backing on elastic strap to prevent strap from slipping while on foot. Cotton terry lining under foot for comfort. Leather front outsole with traditional ballet shoe pleating for turning ease. Sizing Suggestion: XS: US 3, S: US 3.5, 4,4.5 (EU size: 35,35.5), M: US 5.5,6,6.5,7 (EU size: 36.5,37,37.5,38), L: US 8,8.5,9 (EU size: 39,39.5,40), XL: US 9.5,10.5,11 (EU size 40.5,41.5,42). Material: Leather.