Compatible Models: Latest Solo Loop Silicone watch band compatible for Apple watch Series 7 6 5 4 3 2 1 SE 38mm 40mm 41mm 42mm 44mm 45mm. Size: 38mm and 40mm straps are suitable for 41mm straps，42mm and 44mm straps are suitable for 45mm straps. 38MM/40MM/41MM sizes are compatible for iWatch 38mm/40mm/41mm. 42MM/44MM/45MM sizes are compatible for iWatch 42mm/44mm/45mm. [size]38mm 40mm 41mm–XS –[for wrist:] 133mm-142mm [size]38mm 40mm 41mm–S –[for wrist:] 143mm-161mm [size]38mm 40mm 41mm–M –[for wrist:] 162mm-176mm [size]38mm 40mm 41mm–L –[for wrist:] 177mm-190mm [size]42mm 44mm 45mm–XS –[for wrist:] 144mm-160mm [size]42mm 44mm 45mm–S –[for wrist:] 161mm-177mm [size]44mm 42mm 45mm–M –[for wrist:] 178mm-189mm [size]44mm 42mm 45mm–L –[for wrist:] 190mm-206mm In Order To make the strap more suitable for your wrist, there are sizes for 38mm/40mm/41mm and sizes for 42mm/44mm/45mm. If you have a tape measure, you can measure your wrist by wrapping it tightly around the place where you usually wear the watch. Be accurate when measuring; do not round off. So that you can more accurately understand the size you need. Notice: Choose the watch band that suits your watch size! Quality Service: If you have quality problems, you can contact us at any time. We can provide you with the best quality service and solve your problems, and will provide you with friendly customer service within 24 hours.