Please make sure you measure your wrist properly so the watch will be a perfect fit upon its arrival to you. This is important because you don't want the watch to feel tight on you and you don't want it to move around your wrist either, as it will scratch your crystal and bezel. Also, please don't measure your other watches to determine your wrist size.To properly determine how to calculate the perfect measurement of the watch for you, all you will need is: tape measure OR a ruler and a piece of thread.
Encircle a tape measurer around your wrist until it's almost snug on you. That is, you should see no room when the measurer is around your wrist. Just like in this photo, write down how many inches the measurer illustrates. This is your wrist circumference.
Now that you have that value, add half an inch to it. As a result, the measurer should slightly be able to move around your wrist. (Ex. 5½ inches plus ½ inch = 6 inches. Therefore, the watch should be sized to 6 inches.)
When you receive your watch, it should not be loose and the watch should not move around your wrist. It should stay in place with the head of the watch faced toward the center.