To choose the correct size of your bracelet just measure your wrist and choose the same size of the bracelet on the product page. If you measure 17cm, for example, you need to choose 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 30 days, but you will be responsible for the transport costs to return the products back to us.