An Optional velcro strap in black or grey was made available – these straps attached to the initial male hyperlink in the bracelet. Thankfully, The material strap with the IW3715-36 and also the alternate rubber strap through the IW3548 suit the Aquatimer! , Rolex. Normally a name to reckon with, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/