An Optional velcro strap in black or grey was provided – these straps hooked up to the primary male connection of the bracelet. The good thing is, The material strap with the IW3715-36 as well as the alternate rubber strap from the IW3548 healthy the Aquatimer! “Swiss Produced” on the https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/