Go to any watch meet-up and you will see it within a few minutes. A Rolex Submariner worth five figures, sitting on a strip of rubber. An Audemars Piguet Royal Oak with its steel bracelet gone. A Cartier Santos wearing a strap Cartier never made. The watches are still as serious as ever. It is what holds them on the wrist that has changed.
Ten years ago, putting a rubber strap on an expensive watch was a niche thing, mostly for divers and people who liked to tinker. Now it is everywhere, and a lot of that comes down to younger collectors who buy these watches to wear them rather than lock them away. The reasons make sense once you think about it. The metal bracelet is lovely, but it is also the part that takes the most punishment. It gets scratched on desks and car doors. The links loosen and stretch over the years, so the bracelet starts to sag, and you have probably seen an older watch droop when someone holds it on its side. A worn bracelet also knocks money off the resale price, and we are talking about watches that can cost as much as a car. So a lot of owners take the bracelet off the day they buy the watch, put it away in perfect condition, and wear something cheaper that they do not mind scratching.
Then there is comfort. Rubber is light, it does not catch arm hair, and it handles the things that ruin a metal bracelet. Sweat, sunscreen, chlorine and saltwater all run off it instead of getting trapped. A dive watch is built to go hundreds of metres underwater, but most of them never leave the office. Put one on rubber and it is finally set up for the job it was made for. There is also the look of it. Changing the strap can completely change the feel of a watch. You can take a dressy steel sports model and turn it into something you would actually swim in, or tone down a flashy piece so it draws less attention, which in some places matters more than you might think.
So what makes a good rubber strap different from a cheap one? It mostly comes down to the material. The cheap straps you have seen for years are usually silicone or low-grade rubber. They feel soft in the shop, but they grab dust and lint, go sticky in the heat, start to smell, and lose their shape. The straps that watch people actually want are made from FKM rubber, short for fluoroelastomer. It is the same kind of material first made for seals in planes and cars, where you cannot afford for it to fail.
FKM is dense and does not soak anything up. It handles chemicals, sunlight and a huge range of temperatures, and it will not hold sweat or smells. Wear it every day and it keeps its shape and colour instead of going soft and faded. It feels like part of the watch, not like something off a pool toy. That is a big reason the better brands are happy to put a lifetime warranty on it.
But the material is only half of it. The other half is fit, and this is where most cheap straps fall apart. A watch case is not flat. The lugs curve, the gap between them is measured down to the millimetre, and the bottom of the case has its own shape. If a strap is just shoved between the lugs, you get a little gap where the rubber meets the steel, and it looks wrong. A good strap is made for one specific watch, so the end of the strap follows the exact curve of that case and the two look like one piece. Put a generic strap on a Submariner and something feels off. Put on one built for it and you notice the difference straight away.
That focus on getting the fit right for each model is how Helvetus has grown into one of the biggest names in this space, with more than 45,000 customers in just a few years. Instead of one strap that sort of fits everything, they build each FKM strap around a specific case. The straps are made to work with your watch’s original buckle and come off again whenever you want, so nothing you do is permanent. The range is huge. Along with their best-selling Rolex rubber straps, made for everything from the Submariner and Daytona to the GMT-Master II and Datejust, they do straps for Tudor, Omega, Panerai, IWC and even the Omega × Swatch MoonSwatch, the cheap plastic chronograph that did more than anything to get younger buyers into swapping straps.
Cartier is the one that surprises people. For years Cartier owners stuck to leather, and the Santos in particular, with its exposed screws and square case, is hard to fit with anything but the strap it came on. The Helvetus rubber straps for the Cartier Santos are cut to match that tricky shape, which is part of why Cartier has become one of their best sellers. They ship worldwide and reach just about anywhere a collector lives, from big cities to tiny islands and out-of-the-way territories. Shipping is free, there are no surprise customs charges to deal with, and every rubber strap is covered for life, which makes trying one feel pretty low-risk.
None of this means the bracelet is finished. Most people keep theirs, safe and unmarked, ready to put back on for a wedding or before they sell. That is really the whole idea. A good rubber strap is not a downgrade. It just gives you another way to wear an expensive watch, more often and more freely, without babying it, while the part that holds most of its value stays exactly as it left the factory. For people who actually use their watches, that is an easy call to make, and an easy one to undo if you ever change your mind.
This article was written in cooperation with Helvetus