1. Compatibility: The silicone sports straps are compatible with Apple Watch sizes 38mm, 40mm, 41mm, 42mm, 44mm, 45mm, 46mm, and 49mm, as well as iWatch models including Series 10, Series 9, Series 8, Series 7, Series 6, Series 5, Series 4, Series 3, Series 2, Series 1, SE, Ultra, Ultra 2, and Sport Edition (strap only, watch not included). 2. Color Clasp: This strap features a pinandtuck closure design and is compatible with Apple Watch sizes 38mm/40mm/41mm/42mm (Series 10) and iWatch sizes 42mm (Series 3/2/1), 44mm, 45mm, 46mm, and 49mm. The colormatched pin closure enhances the stylish look of your watch. It's a gift for men and women on occasions like birthdays, Father's Day, Mother's Day, Valentine's Day, Christmas, and Year's Day. 3. SkinFriendly Silicone: Made from soft, hypoallergenic silicone, this strap ensures comfort and prevents skin irritation. Its smooth texture provides a lightweight feel, while its waterproof and quickdrying properties offer breathability and allday comfort. 4. Size Guide: 38mm/40mm/41mm/42mm (Series 10) S/M fits wrists 130mm–180mm. 38mm/40mm/41mm/42mm (Series 10) M/L fits wrists 150mm–200mm. 44mm/45mm/46mm/42mm (Series 3/2/1) S/M fits wrists 140mm–190mm (5.5–7.5 inches). 44mm/45mm/46mm/42mm (Series 3/2/1) M/L fits wrists 160mm–210mm (6.3–8.3 inches). 49mm fits wrists 150mm–210mm (5.9–8.3 inches). Please confirm your watch model and wrist size before .