An Optional velcro strap in black or grey was presented – these straps hooked up to the first male backlink of the bracelet. The good thing is, The material strap with the IW3715-36 as well as the alternate rubber strap from the IW3548 in good shape the Aquatimer! Rolex helps https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/