Apple MT653ZM/A Smart Wearable Accessories Band Orange Fluoroelastomer, Titanium

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.