Often, you don't have to measure your wrist for a watch band mainly because your existing strap provides a size printed on its reverse. Examine the inside width of your watch lug for your size that appears in millimeters dependant on the interior width of your watch lugs. Thanks Manny. https://alexiseaqgx.xzblogs.com/63635693/5-simple-techniques-for-white-apple-watch-strap-38mm