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Why men are talking about testicular heat

Sauna is hot.
The testes are designed to stay cooler.

Sauna offers benefits that have made it a cornerstone of many wellness routines. But male reproductive biology adds another consideration: the testes normally function at a lower temperature than the rest of the body, and research has shown that elevated testicular heat can affect sperm-related measures.

Now, some of the most recognizable voices in health and longevity are bringing that conversation into the mainstream — including localized cooling during sauna.

See What They’re Saying Explore the Research

Why this conversation matters

Why cool something in a hot sauna?

The testes sit outside the body for a biological reason: sperm production is temperature-sensitive.

Sauna intentionally raises heat exposure throughout the body. That has prompted researchers — and increasingly mainstream health voices — to ask a simple question: can you enjoy the sauna while being more intentional about localized testicular temperature?

Enjoy the heat.
Keep cooling where it matters.

Mainstream voices

The conversation has gone mainstream.

Sauna-related testicular cooling is no longer an obscure topic buried in academic literature. Several prominent voices in health, performance, and longevity now openly discuss testicular heat exposure and localized cooling as part of the sauna conversation.

Bryan Johnson

Founder of Blueprint · Longevity-focused self-experimenter

Bryan Johnson publicly documents an intensive sauna protocol and includes groin cooling as part of his routine.

View Bryan Johnson's Sauna Protocol

“For men doing a sauna protocol: definitely ice the balls!”

Bryan Johnson

His published protocol describes using an ice pack at the groin during his sauna sessions. He has also publicly reported changes in his own fertility markers with and without cooling.

His reported fertility-marker results are a personal self-experiment, not a controlled clinical trial.

Andrew Huberman, PhD

Huberman Lab · Neuroscience & health educator

Huberman has explicitly discussed the reproductive-temperature considerations of deliberate heat exposure in his official sauna guidance.

Read Huberman's Heat Protocol

“Men wishing to avoid sperm count reductions due to heat may opt to apply a cool or cold pack while in the sauna.”

Andrew Huberman, PhD

His deliberate heat guidance discusses repeated heat exposure as a consideration for men concerned about sperm production, and presents localized cooling during sauna as an option.

Rhonda Patrick, PhD

FoundMyFitness · Biomedical science communicator

Dr. Rhonda Patrick has repeatedly discussed sauna research and has dedicated content addressing male fertility, sperm health, and whether men trying to conceive should avoid sauna and hot tubs.

Explore Rhonda Patrick's Discussion

Key takeaway

Heat exposure is an important consideration in male fertility and sperm health, particularly for men actively trying to conceive.

Bryan Johnson, Andrew Huberman, Dr. Rhonda Patrick, Blueprint, Huberman Lab, and FoundMyFitness are not affiliated with Sauna Essentials and do not endorse SaunaGuard.

The common thread

Different voices. The same biological concern.

Sauna heat
Testicular temperature
Localized cooling

The details of their protocols differ, but the underlying idea is straightforward: the testicular environment is temperature-sensitive, sauna increases heat exposure, and localized cooling provides a way to manage temperature without cooling the entire body.

The research

The concern did not start on podcasts.

Long before testicular cooling became part of mainstream sauna discussions, researchers were studying how elevated genital temperature affects male reproductive biology.

01

Sperm Count

Human sauna studies have reported reductions in sperm count following repeated heat-exposure protocols.

02

Motility

Researchers have also reported changes in sperm motility following sauna exposure.

03

Sperm Function

Heat-exposure research has identified effects extending beyond count alone, including changes in sperm function and other biological markers.

These findings do not mean every sauna user will experience the same response. They demonstrate that testicular heat is biologically relevant and worthy of consideration. Complete results and follow-up observations are available through the linked research papers.

Key heat-exposure studies

The primary literature

Sauna Exposure & Human Spermatogenesis

Garolla et al. · Human Reproduction · 2013

Ten healthy men underwent two 15-minute Finnish sauna sessions per week at 80–90°C for three months. At the end of the sauna-exposure period, researchers reported significant changes in sperm count and motility, along with changes in mitochondrial function, sperm chromatin packaging, and cellular responses to heat stress.

Read on PubMed

Acute Sauna Exposure & Sperm Measures

Brown-Woodman et al. · 1984

Researchers examined semen measures following acute sauna heat exposure and reported measurable changes after the heat exposure.

Read Study

Genital Heat Stress & Semen Quality

Jung et al. · 2007

A review of human genital heat-stress research examined the relationship between elevated testicular temperature and spermatogenesis and semen quality.

Read Review

Why localized cooling

If the concern is local temperature, why cool the whole body?

The goal of localized cooling is not to eliminate the heat experience of sauna. It is to manage temperature in one particularly temperature-sensitive area while allowing the rest of the body to remain exposed to sauna heat.

Whole-body heat
+
Localized cooling

A temperature-conscious approach to sauna.

Cooling research

Can wearable cooling actually lower local temperature?

Yes — wearable cooling has been shown to reduce measured scrotal skin temperature.

Wearable scrotal cooling

Zumstein et al. · 2021

Researchers evaluated specialized cyclic cooling underwear and continuously monitored scrotal skin temperature. The cooling system produced a measurable reduction in scrotal skin temperature during use.

Key takeaway

Localized wearable cooling can meaningfully change the temperature of the scrotal environment.

View Study

Systematic review

Scrotal Cooling & Male Fertility

Nikolopoulos et al. · 2013

Researchers reviewed the available literature on scrotal cooling and male fertility. The literature suggested potential benefits but was not sufficient to establish firm conclusions about fertility outcomes.

View Review

Temperature reduction is supported by direct measurement. A guaranteed fertility benefit is not established.

From the science to SaunaGuard

We saw a practical problem nobody had solved well.

The idea of keeping the testicular area cooler during sauna is not new. The practical problem is implementation.

Holding an ice pack in place during an entire sauna session is inconvenient. And for people who sauna at a gym, the frozen pack also has to survive the commute and workout before the sauna begins.

1

The Cotton Cooling Brief

A dedicated front pouch keeps the reusable cooling insert positioned without requiring you to hold it in place.

2

The Reusable Cooling Insert

Designed to provide localized cooling while sitting inside its cotton cover and dedicated pouch.

3

The Insulated Travel Cooling Case

Designed to slow warming while the insert travels from your freezer, through your commute and workout, to your sauna session.

Freeze at home
Carry to the gym
Load after your workout
Sauna

Microplastic-conscious design

Heat wasn’t our only consideration.

We also thought carefully about what sits next to your skin.

SaunaGuard was designed with a 100% cotton brief body and a cotton cover around the reusable cooling insert. Our goal was simple: when a natural-fiber layer can sit next to the body, we prioritize cotton.

100% cotton brief body

Natural-fiber fabric throughout the main brief body.

Cotton-covered insert

A cotton layer surrounds the reusable cooling insert before placement inside the pouch.

Microplastic-conscious design

A materials approach that reduces reliance on synthetic textile layers directly next to the wearer.

Explore the research

Don’t take our word for it.

Explore the research and discussions behind the design.

Peer-reviewed research

  • Sauna exposure and spermatogenesis

    Garolla et al. · Human Reproduction · 2013

    View PubMed

  • Sauna exposure and sperm measures

    Brown-Woodman et al. · Archives of Andrology · 1984

    View Study

  • Genital heat stress and semen quality

    Jung et al. · Andrologia · 2007

    View Study

  • Wearable scrotal cooling

    Zumstein et al. · The Journal of Urology · 2021

    View PubMed

  • Scrotal cooling systematic review

    Nikolopoulos et al. · J. Obstetrics and Gynaecology · 2013

    View Study

Mainstream discussion

Enjoy the heat.
Keep cooling where it matters.

SaunaGuard turns a conversation already happening in health and longevity into a practical, travel-ready cooling system.

Explore SaunaGuard KitsSee How It Works
Explore the Research ↑

This page is provided for general education and is not a substitute for individualized medical advice. Men actively trying to conceive or managing a reproductive-health concern should discuss sauna exposure with a qualified healthcare professional.