An Optional velcro strap in black or grey was made available – these straps hooked up to the initial male connection of the bracelet. Thankfully, The material strap in the IW3715-36 along with the alternate rubber strap from the IW3548 healthy the Aquatimer! Rolex will make in excess of 1M https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/