Journal
What Is a TROPIC® Strap? Meet the Original Rubber Dive Strap
July 14, 2026
Ask a watch collector to name one rubber strap and the answer is almost always the same: the TROPIC®. Introduced in 1955, it is the rubber dive watch strap that all the others imitate. This page comes straight from the source, because tropicstrap.com is the home of the one genuine TROPIC® strap.
The short answer
A TROPIC® strap is a tapered rubber dive strap with a perforated, basket-weave surface, produced under a trademark that has been registered since 1955. It is not a style, a material or a generic word. One company makes it, and every genuine example carries the TROPIC® name embossed on the inner side.
Why the weave is there
The famous cross-hatched surface was engineered before it was admired. The texture lets air move across the wrist, so the strap stays cool and dry where flat rubber traps sweat. Water drains away through the pattern instead of pooling under the band. Ribbed edges give the strap shape without stiffness, and the deeply embossed underside keeps it comfortable through a long day in and out of the water.
The strap also tapers. The 20mm version narrows to a 16mm buckle and the 22mm to an 18mm buckle, which keeps the clasp side slim and balances the watch head on the wrist.
Chosen by the watches that wrote diving history
Through the 1950s, 60s and 70s, the TROPIC® strap was the factory-offered rubber option for many of the most celebrated dive watches ever made, among them the Rolex® Submariner, the Blancpain® Fifty Fathoms and the Omega® Seamaster 300. The French Navy issued it on its Tudor® Submariners. In the United States it was distributed by BestFit in the signature blue packaging that collectors still recognise today. The full story is in our history of the TROPIC® strap.
What today’s TROPIC® is made of
The modern strap is produced in Italy from a proprietary vulcanised natural-rubber compound, developed for UV resistance, tensile strength and stability in heat and cold. It contains no silicone, no PFAS and no other forever chemicals, and it is hypoallergenic. That distinction matters: most imitations are silicone, which attracts dust and lacks the structure that makes natural rubber wear so well.
Sizes, length and fit
Two lug widths are offered, 20mm and 22mm, each tapering as described above. Usable length is 185mm with an overall length of 210mm. The result is a slim, light strap that disappears on the wrist, which is exactly what divers asked for in 1955 and what collectors still want now.
One original, many imitations
The design has been copied so often that some people use the word tropic for any basket-weave band. The trademark, the tooling and the embossed name say otherwise. If you are weighing the real thing against a look-alike, read how to tell a genuine TROPIC® strap from a copy, and if you are torn between our two originals, see TROPIC® or ISOfrane®.
Explore the TROPIC® strap collection
Your questions, answered
Is TROPIC® a style of strap or a brand?
A brand. TROPIC® has been a registered trademark since 1955. Many companies imitate the basket-weave look, but only the strap made under the TROPIC® name, with the name embossed inside, is the original.
Which lug widths are available?
The genuine TROPIC® strap comes in 20mm and 22mm. The 20mm version tapers to a 16mm buckle and the 22mm version to an 18mm buckle.
Is the TROPIC® strap silicone?
No. It is produced in Italy from a proprietary vulcanised natural-rubber compound that is silicone-free, PFAS-free and hypoallergenic.
How long is the strap?
Usable length is 185mm, with an overall length of 210mm, which fits the large majority of wrists comfortably.
How can I be sure mine is genuine?
Turn it over. Every genuine strap carries the TROPIC® name embossed on the inner side, as it has since 1955. Our guide to spotting a genuine TROPIC® strap covers the other checks.
TROPIC® and ISOfrane® are registered trademarks owned by Synchron. Rolex®, Blancpain®, Omega®, Tudor®, Zodiac®, LIP®, Aquadive®, Aquastar® and DOXA® are trademarks of their respective owners. These companies are not affiliated with tropicstrap.com and do not endorse the TROPIC® strap.