The size of your Apple Watch Ultra band depends on the size of your wrist. Here are the specific sizes of the Apple Ultra Watch band: Small for wrists 130-160mm, medium for wrists 145-190mm, and large for wrists 165-210mm.
If you pay more attention to appearance and sturdiness, you can give priority to mountain loops; if you pay more attention to lightness and comfort, you can prioritize trail loops if you pay more attention to waterproof; and versatility, you can favor the choice of an ocean bracelet.
In addition, you can also choose a third-party watch strap after purchase, or purchase other watch straps on Apple's official website, to better meet your needs. It's worth noting that while the Apple watch Ultra comes standard with a 49mm strap, it's also compatible with the 45mm version.u Apple watch bracelet.
The main difference between the standard and extra-large Apple Watch bands is the number and spacing of the holes.
Specifically, oversized holes have more holes and are spaced further apart. This design is primarily intended to meet the needs of the Apple Watch Ultra in environments such as endurance sports, outdoor adventures, and ocean exploration.
The above information is for reference only. If necessary, it is recommended to consult Apple official personnel.