Apple Watch 49mm [Black] Ocean Band Extension [Black Titanium Finish]Made from the same high performance elastomer as the Ocean Band, this band extension lengthens the 49 mm Ocean Band by an additional 50 millimetres perfect if you need extra length to wear the band over your wetsuit. The extension comes with an extra adjustable, corrosion resistant titanium loop which you can place in any tube to tuck the excess band into. This extension must be used with the regular Ocean Band. Band Size One Size Band fits 130 to 250