It features nine different set sizes. And since it’s just one piece, it means that you won’t have to deal with any buckles or magnets to get the band on and off your wrist to get the right one, you can just measure your wrist using Apple’s template and or there are the right size, so you can use slip it on and off, once it’s installed. Apple Watch Solo Loop is available in both 40 and 44 millimeters.