Seamless Design: Made from two textile layers woven together seamlesslyDurable Material: Strong yarns reinforce the top loops for maximum durabilityMade to Fit: Secure fit with anti-corrosion titanium G-hook that slides easily into the loopsCompatibility: Apple watch case size 49mm/ 45mm/ 44mm Series Ultra2/Ultra/9/8/7/6/SE/SE2/5/4/3/2/1