An Optional velcro strap in black or grey was made available – these straps attached to the 1st male connection with the bracelet. The good news is, The material strap through the IW3715-36 and also the alternate rubber strap with the IW3548 healthy the Aquatimer! Outside of its excellent corrosion https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/