Minus your watch head measurement from your wrist size measurement. This provides you with the entire watch band size necessary. Apple Watch Ultra is likewise compatible with 45mm bands, but 45mm bands should only be worn for casual, daily don. high-quality craftsmanship. i.e much less expensive (thinner) nylon materials, small https://backbraces00099.pages10.com/not-known-details-about-xl-apple-watch-band-42mm-62534437