To choose the right size of your bracelet just measure your wrist and choose the same size of the bracelet in the product page. If you have 6.7 inch, for example, you need to choose exactly the same size of the bracelet in the product page. Please, do not assume that the bracelets are too tight or too loose, just choose the exact size. If you choose the wrong size, you can change the bracelet within 14 days, but you will have to support the transport expenses toward us and back.