American Flag String Thong Bikini 82% Polyamid and 18% Elasthan,High Elasticity, Soft and Comfortable Three sizes: S= US(4-6), M= US(8-10), L=Fits like US 12 Suggest you buying the size according to your cup. Size small fits for cup A-B; Size Medium fits for cup C-D, Size Large fits for cup D-E.Adjustable at neck, back, bottom 2 sizes