An Optional velcro strap in black or grey was made available – these straps hooked up to the 1st male backlink in the bracelet. Luckily, The material strap through the IW3715-36 as well as the alternate rubber strap through the IW3548 match the Aquatimer! Over and above its superior corrosion https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/