The Ocean Band is molded 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 band during high-speed water sports. For extra length, an extension band is sold separately — perfect if you need extra length to wear the band over your wetsuit. Apple Watch Ocean Band One adjustable loop Material: Titanium, Fluoroelastomer