An Optional velcro strap in black or gray was available – these straps attached to the initial male backlink on the bracelet. Fortunately, the fabric strap in the IW3715-36 as well as alternate rubber strap in the IW3548 suit the Aquatimer! There's a beautifully one of a kind double index https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/