An Optional velcro strap in black or grey was provided – these straps connected to the first male backlink on the bracelet. The good thing is, the fabric strap with the IW3715-36 and the alternate rubber strap within the IW3548 fit the Aquatimer! There's a beautifully one of a kind https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/