Two Sizes: 38mm/40mm/41mm/42mm(Series 10) Size fits 5.1"-7.1" (130mm-180mm) wrist； 44mm/45mm/46mm/49mm/42mm(Series 3 2 1) Size fits 5.9"-7.9" (150mm-200mm) wrist -- Please check the backside of your iWatch to make sure the correct watch model and size you choose -- Which Apple watch version is the size "38mm/40mm/41mm/42mm(series 10)" compatible with? This size is compatible with Apple watch Series 10 (42mm) & Series 9/ 8/ 7 (41mm) & SE 2/SE (40mm) & Series 6/ 5/ 4 (40mm) & Series 3/ 2/ 1 (38mm). Which Apple watch version is the size "44mm/45mm/46mm/49mm/42mm(Series 3 2 1)" compatible with? This size is compatible with Apple watch Ultra 2/ Ultra (49mm) & Series 10 (46mm) & Series 9/ 8/ 7 (45mm) & SE 2/ SE (44mm) & Series 6/ 5/ 4 (44mm) & Series 3/ 2/ 1 (42mm). Is it OK to swim with this silicone Apple watch band? Yes, the apple watch strap is fully waterproof and do not require special care. What scenarios is the stylish band suitable for? The sweat-proof and water-resistant features of our bands makes them the perfect companion for work, workouts, running, swimming, or any active lifestyle, keeping your Apple Watch safe and dry no matter what you do. What's in the package? 1 x Silicone Sport Bands for Apple Watch (Apple Watch is Not Included). Product Comparison Table New Sport iWatch Bands Buying Options New Bling iWatch Cover Buying Options 6 Pack Sport iWatch Bands Add to Cart Ocean Sport iWatch Bands Add to Cart Customer Reviews 4.6 out of 5 stars 276 4.5 out of 5 stars 4,665 4.8 out of 5 stars 42 4.4 out of 5 stars 28 Price $5.94$5.94 $8.09$8.09 $9.98$9.98 $9.99$9.99 Compatible Device iWatch All Models Most iWatch Models iWatch All Models iWatch All Models Product Material Soft Silicone Hard PC Soft Silicone Silicone, Titanium Product Features Soft, Comfortable, Waterproof Diamond Face Cover Soft, Comfortable, Waterproof Soft, Comfortable, Breathable Closure Type Pin-and-tuck None Pin-and-tuck Tang Buckle Easy to install ✔ ✔ ✔ ✔ Multi-color Choices ✔ ✔ ✔ ✔ Stylish Look ✔ ✔ ✔ ✔