YEMA Black Tropic Dive Strap 19mm SYSUP TP19 SS Bezel House TROPIC Textured Rubber Diving Strap in YELLOW WatchObsession Watch Tropical Y strap fjm44 Shop Synchron Watches. Inspired from the 1960's tropical style rubber straps, this new design will please YEMA's vintage watch collectors but also those who are looking for the perfect strap to wear during aquatic based or physical activities. Made on TPU (Thermoplastic Polyurethane), this rubber like material is extremely flexible, durable and smooth to the touch. It's the perfect sweat wicking material, and the easiest strap type to wash. With its thin size, diamond shaped outer pattern, waffle pattern on the reverse side, and a YEMA branded steel buckle, this new YEMA Heritage Dive watch Strap is available in 19mm and 20mm.