An Optional velcro strap in black or grey was made available – these straps connected to the 1st male url in the bracelet. Luckily for us, the fabric strap through the IW3715-36 and the alternate rubber strap in the IW3548 suit the Aquatimer! Together with the extremely corrosion-resistant 904L stainless https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/