Aquafirst. Stretch back. Medium leg. Quick drying. High UVA/UVB Protection. 85% Polyester 15% Elastane. Machine washable. Aqua Sphere Girls Size Guide - Age 4: Chest 55cm, Age 6: Chest 60cm, Age 8: Chest 65cm, Age 10: Chest 70cm, Age 12: Chest 75cm, Age 14: Chest 80cm. Ref: UTAS272