The watches do not have a size, they are all models with a single measure. If you want to adjust the strap of your watch to fit your wrist once purchased, you can visit any of our physical Time Road points of sale, where they can consider the adjustment to the measure you need.
Depending on the material of the watch strap, it will be necessary to send it to our official technical service. The store staff may ask you for the purchase receipt that will be found in the box of your order. In that case, you can also show the order confirmation email, either printed or on your phone.