A TRUE WORK OF ART. - Waterproof - Wear it in the sea, pool or in the shower - Heat and sweat resistant - Wear it during workout - No discolouring or tarnishing - Hypoallergenic (No green skin) - Lifetime warranty - Designed in Copenhagen Size : One size. 50cm + 2cm adjustable - (Fits more than 95% of our customers. Most prefer this size)