An Optional velcro strap in black or gray was provided – these straps hooked up to the initial male connection from the bracelet. Luckily, The material strap through the IW3715-36 as well as alternate rubber strap within the IW3548 fit the Aquatimer! Together with the remarkably corrosion-resistant 904L chrome steel https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/