Vulcanized rubber bands are superior material in every way to other watch strap alternatives including silicone rubber bands, leather bands and NATO straps. Vulcanized Rubber is very comfortable to wear and is naturally hypoallergenic.

Rubber, especially the kind that Rubber B uses – Vulcanized Rubber – is a far more reliable watchband for a timepiece. Similar to its leather counterpart, it is comfortable to wear. It is supple and moves easily to the wrist. Although it contours to the shape of your body, it doesn't get stuck or sag.

Advantages of Silicone: This structure allows for silicone to be stronger and more resistant to heat and light than standard rubber. The water resistant properties of silicon make it an ideal choice for outdoor activities, be it diving in cold ocean water or hiking on a hot sweaty day.

That's because most of the work and cost in developing a rubber strap is taken upfront in the production. Rubber straps are made via an injection-molding process, which requires a mold for each specific size, and running of heavy machinery.