Rubber B: the rubber strap fitted to the case
Rubber B manufactures molded vulcanized rubber straps in Switzerland for a specific watch model. The strap fits the case perfectly, with no gap between the case and the strap, just like an original strap. It is therefore chosen by watch model, not by width.
By watch brand
Rolex, Tudor, Panerai, Audemars Piguet Royal Oak, Patek Philippe Nautilus and Aquanaut, IWC and Omega.
Original clasp or buckle provided
Two mounting options are available. Straps designed for the original clasp reuse the clasp from your watch. The "with buckle" versions are supplied with a steel pin buckle. The product page for each strap specifies the mounting and compatible models.
The series
Classic, in one or two colors; SwimSkin, with an alligator, ballistic canvas, or sailcloth look; Velcro; and Cuff, a universal pin buckle strap for 20, 22, and 26 mm lug widths.
For everyday wear
Vulcanized rubber is water- and UV-resistant and is hypoallergenic. Rinse it with clean water after swimming. The Rubber B strap guide for Rolex explains how to choose.
Frequently asked questions
Will my Rolex clasp fit a Rubber B? Yes, on the references designed for the original clasp. If you prefer a pin buckle, choose a "with buckle" version.
Will a 40 mm Submariner Rubber B fit a 41 mm Submariner? No: each case generation has its own strap. See the Submariner 40 mm and Submariner 41 mm pages.
How do I choose the size? Some references are available in several lengths, from XS to XL; the product page indicates the corresponding wrist size.

