Buy a soft watch strap on Amazon and you'll see the words "silicone" and "rubber" used interchangeably. They aren't. The two materials behave differently, age differently, and feel different the moment they touch your wrist. If the strap is going on a watch you paid hundreds of dollars for, it's worth knowing which one you're actually wearing.
This is the short version of a conversation that occupied a week of our build process.
What "rubber" actually means.
Most watch straps sold as "rubber" are either natural rubber, synthetic rubber (typically isoprene or nitrile), or — increasingly — fluoroelastomer, a high-end synthetic used by Rolex, Omega, and AP on their factory-issued straps. Genuine fluoroelastomer is the gold standard for rubber straps: extremely resistant to oils, sunscreen, sweat, and UV. It also costs about 4–6× what regular silicone costs to manufacture.
Most $19 "rubber" straps on Amazon are not fluoroelastomer. They are softened cheap synthetic rubber, sometimes with a silicone coating, frequently using fillers and plasticisers that degrade fast. The first sign is a chemical smell that won't fully air out. The second sign is the strap going stiff and cracking within six to twelve months.
What silicone actually means.
Silicone is a fully synthetic polymer with a different molecular backbone from rubber — silicon-oxygen, not carbon-carbon. That single difference produces a material that's more flexible, more temperature-stable, hypoallergenic, and genuinely odour-free. The trade-off is that silicone is slightly less resistant to certain solvents (gasoline, brake fluid — things you shouldn't be wiping your watch with anyway) and slightly less resistant to abrasion than fluoroelastomer.
For a daily-wear strap that lives between your wrist and your laptop, silicone wins on almost every metric that matters.
The honest comparison.
| Property | Cheap rubber | Premium silicone | Fluoroelastomer |
|---|---|---|---|
| Smell | Strong chemical | Odourless | Odourless |
| Skin-safe | Variable | Hypoallergenic | Hypoallergenic |
| Sweat behaviour | Sticky | Dry, breathable | Dry, breathable |
| Flexibility (cold) | Stiffens fast | Stays flexible | Stays flexible |
| Colour stability | Fades | Holds | Holds |
| Lifespan (daily wear) | 6–12 months | 2–4 years | 5+ years |
| Cost | Lowest | Mid | Highest ($$$) |
Why we chose silicone.
Three reasons. First: at the $19 price point, we are not going to sneak fluoroelastomer past you. Anyone selling "fluoroelastomer" strap for under $40 is either lying or running the wrong margin. We could have built a $50 strap. We chose to build a $19 one — and at $19, premium silicone is the honest answer.
Second: the Royal Pop is a casual watch by personality. The collab's whole language is colour, playfulness, accessibility. A silicone strap matches that energy. Fluoroelastomer reads more like dive-watch hardware — it would feel mismatched on a watch designed to be fun.
Third: silicone is the most comfortable soft material against skin for the longest portion of the day. That's the part that actually matters when you're wearing the watch. If the goal is to wear the collab, the strap has to be the kind you forget about.
How to tell what you're actually buying.
- Smell it out of the package. No smell or a faint clean scent = premium silicone. Strong rubbery or chemical smell = poor synthetic rubber.
- Stretch test. Premium silicone returns to shape instantly. Cheap rubber stretches and stays slightly stretched.
- Cold test. Put it in the fridge for ten minutes. Silicone stays bendy. Cheap rubber goes stiff.
- Read the listing carefully. "Silicone rubber" is a marketing term that usually means cheap rubber with silicone surface coating. "100% silicone" or "premium silicone" is more honest.
Migatte straps are 100% premium silicone. No fillers, no coatings, no marketing fluff. Four colourways live on Amazon at $19, and every single one of them passes the four tests above. That's the version of the strap we wanted to wear ourselves — so that's the version we ship.