We designed the bracelet so that it holds comfortably, does not strangle you and does not fall. First, measure the wrist circumference, which will tell you the ideal size of the bracelet. If you measure, for example, 7.2 in (18.3cm), reach the recommended size of 6.7/7.5 in - M (17/19 cm - M).
Don't have a tailor's tape on hand? Never mind, cut a strip of paper, wrap it around your wrist and mark its circumference with a pencil. You can then easily measure the length with a classic ruler. Instead of paper, a piece of string will serve similarly.
If you buy a bracelet as a gift, the recipient's watch, for example, will help to measure the wrist circumference.