Can I use my Apple Watch ultra in a sauna and vapor sauna?
Can I use my Apple Watch Ultra in a Sauna and a Vapor sauna?
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Apple says: Avoid "Wearing Apple Watch Ultra in a sauna above 55° C (130° F)"
See this:
About Apple Watch water resistance - Apple Support
Note also that it says:
Avoid "Wearing Apple Watch models other than Apple Watch Ultra in a sauna" and then it says
Avoid "Wearing Apple Watch in a steam room," which seems to include the Ultra.