The simple answer
Yes. A watch rated 100M is fine for swimming, snorkeling, and showering. It is not fine for scuba diving. The "100M" doesn't mean you can go 100 meters deep — it's a pressure rating from lab testing.
The short version
- 30M: splashes only. Don't swim
- 50M: brief swimming, but we wouldn't make a habit of it
- 100M: swim, snorkel, shower, live your life
- 200M+: actual diving territory
- Screw the crown down (if it has one) before you get in the water
What it actually means
Water resistance ratings come from static pressure tests done in a lab. Real life adds movement, temperature changes, and time — which is why the practical rule is one tier below the number.
That's exactly why 100M is our minimum spec for every 1GW watch: it's the rating where you can genuinely stop thinking about it.
What to look for
100M or better, a crown that seats firmly, and gaskets in good condition. On vintage watches, assume no water resistance at all unless it's been pressure-tested recently.
Our picks
Every 1GW watch is 100M minimum. If you want real dive capability, wait for the 1GW DIVER (200M, screw-down crown).
Colin's take
The whole point of a good watch is not worrying about it. 100M is the number where the worrying stops.
FAQ
Can I shower with a 100M watch? Yes. Soap and heat aren't great for gaskets long-term, but it won't kill it.
Does water resistance wear out? Gaskets age. Get them checked every few years if you swim a lot.
What about leather straps? Water ruins leather. Swim on rubber, fabric, or steel.
Keep reading
- Watch Water Resistance Explained: The Complete Guide
- Can You Shower With an Automatic Watch?
- Automatic vs Quartz Watches: What's the Difference?