Not all rubber watch straps are the same material. The term "rubber" covers several distinct polymer types with very different properties, from soft silicone that cracks in sunlight to FKM fluoroelastomers used on dive equipment and motorsport hardware. At JackCoHenry, we work primarily in leather, but we understand rubber well enough to know when to recommend it instead. This guide explains the materials, how they compare, and when rubber is the right strap choice.
The Main Rubber Strap Materials
Silicone (Polydimethylsiloxane)
The most common entry-level rubber strap material. Silicone is soft, lightweight, hypoallergenic, and available in a very wide colour range. It is fully waterproof.
The limitations: silicone attracts lint and pet hair, degrades in UV over time (becoming sticky or cracking), and can feel slightly artificial against the skin. Low-grade silicone straps from mass producers are often the cheapest strap option on the market.
FKM Fluoroelastomer
The premium rubber material used for serious watch straps. Fluoroelastomers (FKM, commercially known as Viton) are fluorinated polymer chains with exceptional chemical and temperature resistance — they are used in motorsport fuel systems, industrial seals, and aerospace applications.
For watch straps, FKM offers: complete waterproofing, resistance to chlorine, seawater, sweat, and UV; temperature stability from -20°C to well above body temperature; and a tactile quality that is noticeably more substantial than silicone. Rubber B and Everest are among the brands producing aftermarket FKM straps for Rolex and Omega.
NBR (Nitrile Rubber)
Used in some mid-range and OEM straps. Better chemical resistance than silicone, lower UV resistance than FKM. Less commonly specified by name — often appears in branded straps without material disclosure.
Natural Rubber
Traditional rubber, occasionally used in vintage-style straps. Less stable than synthetic alternatives — can degrade, harden, or crack with age and UV exposure. Rarely used in contemporary quality strap production.
Comparison Table
|
Material |
Waterproof |
UV Resistance |
Chemical Resistance |
Feel |
Price Range |
|
Silicone |
Yes |
Moderate |
Low-moderate |
Soft, light |
Low–mid |
|
FKM (Viton) |
Yes |
Excellent |
Excellent |
Firm, premium |
Mid–high |
|
NBR (Nitrile) |
Yes |
Moderate |
Good |
Medium |
Mid |
|
Natural Rubber |
Yes |
Poor |
Low |
Variable |
Low–mid (vintage) |
When Rubber Is the Right Strap Choice
-
Swimming, diving, or watersports — leather and nylon retain water; rubber does not.
-
Gym and sustained physical activity — rubber resists sweat and is easy to rinse.
-
High-humidity climates for daily wear — rubber is the most maintenance-free option.
-
Sport watches worn in demanding outdoor conditions.
-
As a rotation option alongside leather for watches used in varied settings.
Frequently Asked Questions
Q. How long does a rubber strap last?
A quality FKM strap should last 5+ years of regular use without degradation. Silicone straps have more variable lifespans — high-quality silicone lasts 2–4 years; cheap silicone may crack or become sticky within 12–18 months of UV exposure.
Q. Can rubber straps be used on dress watches?
Technically yes, practically no in most contexts. Rubber reads as sport and utility — it is appropriate on dive watches, pilot watches, and tool watches. On a dress watch, it conflicts with the watch's design language. Some collectors wear rubber on sport-dress crossover pieces (Submariner, GMT) with deliberate intent; on a Calatrava, it would be incongruous.
Q. How do I clean a rubber strap?
Rinse with fresh water. For more thorough cleaning, mild soap and water, then rinse and air-dry. Avoid alcohol-based cleaners on silicone (can degrade the material). FKM resists most cleaning agents.
Related Articles
→ Sports Watch Strap Guide: Leather, Rubber or NATO?
→ Can You Wear a Leather Watch Strap to the Gym?