The straps on a dive watch need to be long enough to wrap around a thick wetsuit. Most commonly used are rubber straps, as they are easily adjusted and cheap to replace. Stainless steel straps should have two settings, one of which extends the strap to a reasonable length. Velcro watchstraps popularized by surfers are handy for divers using many different thicknesses of exposure suit as they can be set to any length. Velcro or cloth straps are good because they are threaded through both strap-pins and if one pin breaks the watch face is still attached. Remember, watchstraps may become loose when a wetsuit compresses at depth.