An Optional velcro strap in black or grey was made available – these straps attached to the primary male connection in the bracelet. Luckily for us, The material strap within the IW3715-36 and also the alternate rubber strap through the IW3548 in good shape the Aquatimer! Sited on the former https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/