You can use the Ultrahuman Ring in a sauna and a cold plunge. Both the Ring AIR and the Ring PRO are rated for −20°C to 60°C.
That covers many saunas, including infrared saunas. They heat the body directly rather than heating the air, so they run considerably cooler than a traditional sauna, with many operating between 45°C and 60°C.
The operating range might not cover a traditional Finnish sauna, which typically runs between 80°C and 100°C. In this case, owners use the Ring at their own risk.
- Humidity is not the problem: The ring is water-resistant to 10ATM, or 100 metres, and rated IP58 for dust and water, so steam and sweat are well within what it handles. Temperature is the only limit that matters here.
- If you are not sure how hot your sauna runs, check the thermostat: The number on the wall decides it, not the type of cabin. An infrared sauna turned up to its maximum can exceed 60°C, and some gyms run theirs hotter than the default.
How does Ultrahuman Ring track sauna time
In the Ultrahuman app, you can tag both Sauna and Infrared sauna sessions using Smart Tags .
This appears in your Today’s Activities. You can use Jade – Ultrahuman’s biointelligence AI – to understand the effect of sauna sessions on your sleep and recovery.
We compared sauna nights against each member’s own other nights across 180 Ultrahuman Ring members .
On average, sleep efficiency rose, the sleep score increased, and overnight resting heart rate fell slightly.
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