Löyly is the burst of steam produced when water is ladled onto hot sauna stones, and the wave of moist heat that follows. It is the defining moment of a traditional Finnish sauna session. The word describes both the steam itself and the quality of the heat a sauna produces, which is why Finnish speakers talk about a sauna having good or bad löyly.
Why it matters when you are comparing products
Only a sauna with a stone-topped heater can produce löyly. Infrared cabins and sauna blankets warm the body directly and have no stones, so they cannot deliver this experience at any temperature setting.
Where this comes up
- Infrared vs. traditional sauna — The heat-delivery difference that decides whether löyly is possible at all.
- Traditional saunas — Every cabin here uses a stone-topped heater.
Reviewed 2026-08-15