80% Nylon, 20% Spandex Tie closure 80% Nylon,20% Spandex Fabric: Soft fabric, high stretch, comfortable and skin friendly Design: 2 piece set, criss cross, adjustable spaghetti strap, tie back Occasion: Suit for tropical vacations, holiday, summer, beach and pool, water activities Size: Please refer to the size chart as below(not amazon size)