WARM TIPS : Please check the back of your watch is marked 38mm,42mm,40mm 44mm 41mm 45mm or 49mm before making your orders.Hisri Sport Silicone Band Compatible with Apple Watch Series Ultra SE 8/7/6/5/4/3/2/1.1. BREAHABILITY: With special and unique honeycomb air-holes design and it will be more breathable. Especially in summer, it can improve the permeability more effectively. It is a perfect choice for people who sweat a lot or who likes doing sports, swimming or other outdoor sports.2. SKIN-FRIENDLY: Our bands are made from high quality gel material, which will be softer and smoother than other silicone bands, just like the feel of touching baby’s skin.3.ADJUSTABLE REPLACEMENT STRAP: 38mm/40mm/41mm band can be adjusted to the wrist size (5.5"-7.5")140mm-190mm. 42mm/44mm/45mm/49mm band can be adjusted to the wrist size (5.9"-8.4")150mm-214mm. 12-Month Warranty.We are committed to providing our customers with better products and services. Please feel free to contact us if you have any questions. we will respond you as soon as possible with a satisfied solution.