An Optional velcro strap in black or grey was provided – these straps connected to the 1st male connection in the bracelet. Thankfully, The material strap in the IW3715-36 and also the alternate rubber strap in the IW3548 suit the Aquatimer! , Rolex. Often a name to reckon with, Rolex https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/