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. An extension strap is sold separately — perfect if you need extra length to wear the Ocean Band over your wetsuit. Apple Watch Ocean Band One adjustable loop Material: Titanium, Fluoroelastomer