An Optional velcro strap in black or grey was made available – these straps hooked up to the 1st male connection from the bracelet. Luckily, the fabric strap from the IW3715-36 plus the alternate rubber strap from the IW3548 in good shape the Aquatimer! There's a wonderfully exceptional double index https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/