A dry sauna is a wood-lined room where a stove heats rocks to 180 to 195 degrees Fahrenheit at humidity typically under 20 percent, transferring that heat to your skin and raising core temperature. If you're new to it, start with two or three 15-minute sessions a week, adding time and frequency only as your heat tolerance builds.
How a Dry Sauna Works
A dry sauna uses a stove to heat rocks, which then warm the surrounding air to 180 to 195 degrees Fahrenheit at very low humidity, typically under 20 percent. That hot air transfers heat to your skin, and your skin heats the rest of you. Unlike steam rooms or infrared cabins, there's no added humidity or direct light, just intense, dry heat [1].
How to Use One: Frequency, Duration, and Working Up Gradually
If you're starting out, two to three sessions a week at the lower end of the temperature range, around 15 minutes each, is a reasonable entry point. The Finnish research that underpins most of the health data comes from men who built up to four to seven sessions weekly over years, not weeks. Work up gradually: add a session or a few minutes of duration only when the current load feels comfortable. Hydrate before and after, and step out if you feel dizzy or overly flushed. The goal is consistency over months, not intensity on any single day.
The Benefits of Regular Use
Finnish research spanning decades shows men who use a sauna four to seven times a week have about 40 percent lower all-cause mortality than those going once weekly, and roughly half the risk of fatal heart disease [2]. Even two to three sessions a week carry measurable benefits for cardiovascular health and inflammation [3].
The One Part That Doesn't Benefit
While the rest of your body thrives on the heat, your testicles evolved to operate several degrees Fahrenheit below core temperature. Leydig cells, which produce most of the body's testosterone, rely on temperature-sensitive enzyme steps that slow when overheated [4]. Developing sperm cells are equally vulnerable. Sauna use reduces sperm count and motility, and it comes back once the heat exposure stops rather than at the end of a session. In the men who were followed afterwards, count and motility were back to normal six months after they stopped [5].
Why Frequency Outweighs Duration
The Finnish data points clearly at session frequency, not length, as the primary lever for health benefits. A comfortable 180 degrees five times a week beats a punishing 195 once weekly. The heat shock proteins that drive many of these benefits rise with repeated exposure, not single marathon sessions [6].
Cooling the Testicles During the Session
Oakman boxer briefs address the sauna's thermal downside with three things working together: a removable cold pack that slides into a front pocket, separated from skin by a layer of soft fabric, TENCEL-branded MicroModal construction, and an athletic fit with a gusset that gives the testicles room and airflow during the session. The cold pack keeps the testicles nearer their ideal temperature while the rest of you soaks up the heat.
The briefs use TENCEL-branded MicroModal, a wood-pulp-derived fabric blended with ROICA V550, a Japanese clean stretch fiber. An athletic fit with a gusset, an extra panel of fabric, gives the testicles room and airflow whether you're in the sauna or at your desk.
Join the Founding 100
Oakman is sauna cooling for men, launching early fall 2026. Founding members get first access and founding pricing locked in. Reserve your spot.
Frequently asked questions
How hot should a dry sauna be?
Aim for 180 to 195 degrees Fahrenheit. Start at the lower end for shorter sessions if you're new to saunaing, and work up gradually over weeks as your heat tolerance improves.
Does underwear affect scrotal temperature in a sauna?
Yes. Tight, non-breathable fabrics trap more heat. An athletic fit with a gusset promotes airflow, keeping scrotal temperature lower than restrictive designs.
How often should I use a dry sauna?
The strongest evidence supports four to seven sessions weekly, but even two to three show measurable benefits. Consistency matters more than marathon sessions.
This is for general educational and informational purposes only and is not medical advice. It makes no claim about fertility, sperm, or testosterone outcomes from any product. Always talk with a qualified healthcare provider before making changes to your diet, exercise, or health routine. These statements have not been evaluated by the Food and Drug Administration. Oakman products are apparel and are not intended to diagnose, treat, cure, or prevent any disease.
References
- Beever R. (2009). Far-infrared saunas for treatment of cardiovascular risk factors: summary of published evidence. Canadian Family Physician. [Link]
- Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. (2015). Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events. JAMA Internal Medicine. [Link]
- Kunutsor SK, Laukkanen T, Laukkanen JA. (2018). Longitudinal associations of sauna bathing with inflammation and oxidative stress: the KIHD prospective cohort study. Annals of Medicine (Taylor & Francis). [Link]
- Cai H, Qin D, Peng S. (2021). Responses and coping methods of different testicular cell types to heat stress: overview and perspectives. Bioscience Reports. [Link]
- Garolla A, et al.. (2013). Seminal and molecular evidence that sauna exposure affects human spermatogenesis. Human Reproduction. [Link]
- Nava R, Zuhl MN. (2020). Heat acclimation-induced intracellular HSP70 in humans: a meta-analysis. Cell Stress and Chaperones (Cell Stress Society International / Elsevier). [Link]
