The science of sauna
Hot, cold, rest, repeat. Here's why it works.
A two-minute read on where sauna comes from, what real sauna heat is, and what the research says.
An old tradition
Finns have been building saunas for centuries, and today the country has roughly one for every two people. It's not a spa treatment there. It's a weekly habit shared with family and friends.
Real heat
A traditional Finnish sauna runs about 160–200°F, often right around 190°F. Water ladled on the hot stones sends a wave of steam, called löyly, that makes the heat soft and enveloping.
Outdoors by design
The cool-down is half the experience. Stepping outside into fresh air, a cold plunge or a lake is what makes the next round of heat feel so good.
Traditional vs. infrared vs. steam
| Traditional Finnish | Infrared | Steam room | |
|---|---|---|---|
| Temperature | 160–200°F | 120–150°F | 110–120°F |
| Humidity | Low, with bursts of steam you control | Dry | Near 100% |
| How it heats | Hot air and stones warm the whole room | Panels warm your body directly | A generator fills the room with steam |
| Best for | The full ritual, outdoors, with friends | A gentle solo sweat indoors | Gyms and spas |
We build traditional Finnish saunas. It's the heat the research is based on, and the one people keep coming back to.
The research
40%
lower risk of death from any cause for men who used a sauna 4–7 times a week, compared with once a week.
A Finnish study followed 2,315 middle-aged men for about 20 years. The more often they used a sauna, the lower their risk. Two to three sessions a week was linked to a 24% lower risk.
It's an observational study, so it shows a strong link rather than proof. But it's why "most days of the week" is the goal, and why the sauna needs to be somewhere you'll actually use it.
Source: Laukkanen et al., JAMA Internal Medicine, 2015.
The ritual
Not medical advice. If you're pregnant or have a heart condition, check with your doctor first.
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