The Ocean Band is moulded in a high-performance elastomer with a tubular geometry allowing it to stretch for a perfect fit, even over a wetsuit. The corrosion-resistant titanium buckle and adjustable loop secure the strap during high-speed water sports. For extra length, an extension strap is sold separately — perfect if you need extra length to wear the strap over your wetsuit. Features Compatible with : Apple Watch 1-9, SE and Watch Ultra/Ultra 2 Size : 45mm Fits Wrist : 145-220mm