There is exactly one part of this watch you are allowed to change.
The case is a monobloc — cast in a single piece, opening only from the dial side, with a small cover on the back for the battery. The bezel is fixed. The crystal is domed acrylic, the same family of material as the crystal on the watches that actually went to the moon. Nothing about it is modular, nothing is serviceable in the ordinary sense, and there are no reference variants to trade up to.
So the strap isn't an accessory on a MoonSwatch. It's the only decision left.
The size: 20mm
Every MoonSwatch takes a 20mm strap. Every mission, no exceptions — and that includes this one, the Mission to the Moon.
It's the same width as the Omega Speedmaster Professional, which isn't a coincidence: the MoonSwatch case is the same 42mm diameter as the watch it's built after, with the same asymmetrical crown guard and the same "dot over 90" on the tachymeter bezel. If you happen to own both, one strap genuinely serves both watches.
There's a second consequence worth knowing, because it isn't obvious from the way the range is merchandised: our mission collections are a colour menu, not a compatibility list. Every MoonSwatch strap we make is 20mm with the same 126mm and 78mm lengths, cut for the same case. A strap filed under Pluto or Mars fits your Moon exactly as well as the one filed under Moon. That opens the whole range to you rather than one shelf of it.
Why the strap matters more here than on almost any watch
Three reasons, and they compound.
It weighs almost nothing. Reported figures put the complete watch at around 29 grams. At that weight the strap isn't carrying a watch — the two are roughly equal partners, and the strap decides almost entirely how the thing feels on your wrist. Put a substantial rubber strap on it and it starts to wear like a real watch instead of a very good toy.
The factory strap is the one weak part of the design. The Velcro is functional and nobody loves it. It's a consumable: it fuzzes at the edges, it collects lint, and it ages visibly faster than the case does. On a watch this well-resolved, it's the single element that looks like a compromise.
And the case can't be refreshed. Bioceramic — roughly two-thirds ceramic to one-third bio-sourced plastic — is hard, but it marks more easily than steel, and a monobloc case isn't something you send away to be tidied up. Which makes the fitting itself worth slowing down for: work on a soft cloth, keep the spring-bar tool square to the bar, and keep metal away from the case flanks. A slipped tool leaves a mark you live with.
The best straps for the Mission to the Moon
1. Black — the one cut for it
Start with the obvious and it happens to be right. A black rubber strap cut for the Mission to the Moon puts a serious, matte black band under a light grey case and an all-black dial — which is exactly the contrast the original design is built on, and exactly what the Velcro fails to deliver. It's the version that gets mistaken across a room for the watch this one is named after, and the one to buy if you only buy one.
2. Grey with a white line — match the case, not the dial
The smartest pick on this page, and almost nobody thinks of it. The Mission to the Moon's case is light grey, not black — that's the whole reason it reads as steel at a glance. A grey strap with a white line continues the case past the lugs instead of the dial, so the watch becomes one continuous grey object with a black face set into it. It's a more sophisticated read than black, and it's filed under a different mission — which is exactly the point made above.
3. Black with a black line — depth without colour
For anyone who wants the monochrome look but not a flat one. A black strap with a black centre line adds a change of surface rather than a change of colour, so the strap has structure up close and stays completely quiet from a metre away. It suits the all-black dial particularly well, because that dial is doing the same thing — white markers on black, no colour anywhere.
4. White with red — stop it pretending
The honest opposite of pick one. This watch spends its life being mistaken for something more expensive, and some owners would rather it didn't. A white strap with a red interior makes it unmistakably a MoonSwatch — bright, modern, clearly its own thing — and it's the configuration that photographs best in summer. Wear it when you want the watch to be fun rather than reverent.
The short version
20mm, every mission, no exceptions. Black for the faithful version, grey to match the case rather than the dial, black-on-black for quiet depth, white and red when you'd rather it stopped pretending.
Every strap in our MoonSwatch collection is cut for this case, ships with spring bars included, and carries a lifetime warranty on rubber — with free worldwide shipping and no import costs, part of why more than 50,000 customers have trusted us with their watches. There's a full MoonSwatch strap guide covering every mission if you own more than one. Helvetus is not affiliated with Swatch AG or Omega SA.
