An Optional velcro strap in black or gray was made available – these straps hooked up to the initial male link with the bracelet. The good news is, The material strap from the IW3715-36 and the alternate rubber strap within the IW3548 match the Aquatimer! Past its remarkable corrosion resistance, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/