Apple MQEF3ZM/A Smart Wearable Accessories Band Extension Black Fluoroelastomer

Made from the same high-performance elastomer as the Ocean Band, this strap extension lengthens the 49mm Ocean Band by an additional 50 millimetres — perfect if you need extra length to wear the strap over your wetsuit. The extension comes with an extra adjustable, corrosion-resistant titanium loop, which you can tuck the excess strap into. This extension must be used with the regular Ocean Band.