The best cooling underwear for sauna use does three things well: it keeps the cold beneath the testes for the whole session, it holds the cooling in place hands-free, and it puts a natural, breathable fabric against your skin instead of a synthetic blend. Most cooling underwear checks one or two of those boxes. Here's how to compare any pair, and how SaunaArmor measures up on each point.
- A traditional sauna, typically 66–91°C, is a far harsher test than a hot day, so judge cooling underwear by how it performs on the bench.
- Check the body fabric: cotton breathes and avoids synthetic fibers against the skin.
- Check how the cooling is held: a closed pouch beats an open sleeve or a loose pack.
- Check what's included: two inserts let you rotate between sessions.
- Buy from the brand's own site. Several products use names similar to SaunaArmor.
Already know what you need? See SaunaArmor cooling briefs.
Why does sauna cooling underwear need to be different?
Because a sauna is a much harsher environment than everyday heat. Some cooling underwear is designed for a warm commute, a gym session or summer weather. A traditional sauna typically runs at around 66–91°C (150–195°F), and you sit in it for 15 minutes or more. Inserts warm up faster, fabrics behave differently when soaked in sweat, and anything loose shifts when you move on the bench.
The reason men cool the testes in the first place is fertility. Research from the University of Padova found that two 15-minute sauna sessions a week for three months lowered sperm count and motility, with recovery taking months. Cooling during the session is a practical way to reduce that heat at the source. For more, read our guide on how much time to spend in the sauna.
How to choose the best cooling underwear for sauna: a 7-point checklist
Use these seven questions on any cooling underwear before you buy, including ours. Product pages tend to sound the same, so the answers to these specific questions are what separate a good pair from a gimmick.
1. What is the body fabric?
Many underwear brands, including cooling ones, use synthetic blends for stretch. Cotton is breathable and keeps synthetic fibers away from your skin during a hot, sweaty session. Look at the actual fabric composition, not just the marketing name.
2. Where does the cold sit?
The testes are what you're cooling, so check where the pouch sits. Some designs use a front pouch, others sit beneath the testes. It decides where the cold lands.
3. How is the cooling held in place?
A loose pack or an open sleeve shifts when you sit, lean or stand up. A closed pouch, such as one with a zip, keeps it where you put it.
4. Is there a barrier between the cold and your skin?
A frozen insert should never sit directly on scrotal skin. Look for a fabric layer built into the pouch.
5. How many inserts come with it?
One insert means waiting for it to refreeze between sessions. Two let you rotate, which matters if you sauna several times a week.
6. What are the inserts made of?
Check that the inserts are labeled BPA-free and non-toxic, and that they're reusable rather than single-use.
7. Sizing, guarantee and where you buy it
A good fit is snug enough to hold the pouch in position. Look for a clear size chart, a money-back guarantee and an official store. Several products in this category use names close to established brands, so check who is actually selling it.
How does SaunaArmor compare?
SaunaArmor was built for the sauna from the start. Here is how it answers each point on the checklist.
| Checklist point | What to look for | SaunaArmor |
|---|---|---|
| Body fabric | Breathable, no synthetic blend against the skin | 100% cotton body |
| Where the cold sits | Beneath the testes | Pouch positioned beneath the testes |
| How it's held | Closed pouch, hands-free | Horizontal zip pouch |
| Skin barrier | Fabric between insert and skin | Built into the pouch |
| Inserts included | Two, for rotation | Two reusable inserts per pair |
| Insert material | BPA-free, non-toxic, reusable | BPA-free, non-toxic, reusable |
| Cooling time | A full session | Each insert is designed for one 30-minute session |
| Sizing | Clear size chart | S to XXL by waist size |
| Guarantee | Money-back guarantee | 30-day money-back guarantee |
| Where to buy | Official store | saunaprotocol.co |
What makes it different in practice
The zip pouch is the detail that matters most on the bench. It keeps the insert in one spot whether you sit upright, lean back or move between benches, so you never reach down to adjust it. The pouch fabric also means the insert never touches bare skin.
The cotton body is the second difference. If you choose sauna for its health benefits, it makes sense to avoid having a synthetic blend pressed against your skin in the heat. And because every pair comes with two inserts, you can keep one in the freezer and always have one ready.
Built for the sauna, not adapted for it. Two reusable inserts per pair, a 100% cotton body and a 30-day money-back guarantee. Find your fit on the size chart.
SaunaArmor vs. SaunaBoxers vs. Health Hercules
All three are cotton cooling briefs aimed at sauna users. The main differences are where the cold sits, how many inserts you get and how each brand backs its product. The details below come from each brand's official product page, checked in October 2026; check current details before you buy.
| Feature | SaunaArmor | SaunaBoxers | Health Hercules |
|---|---|---|---|
| Body fabric | 100% cotton body | 100% cotton body | 100% cotton |
| Cooling insert | Reusable, BPA-free, non-toxic insert | Pre-shaped ergonomic ice pack | BPA-free, non-toxic gel pack |
| Inserts included | 2 per pair | 1 per pack | 1 per pair (2 free with a first order) |
| Pouch position | Horizontal zip pouch beneath the testes | Front pouch | Front cooling pouch |
| Guarantee | 30-day money-back guarantee | 1-year warranty; 30-day returns on unworn items | 30-day money-back guarantee |
Cotton is now standard in this category, so it's no longer the deciding factor. If you want two inserts in the box and cooling held beneath rather than in front, SaunaArmor is built that way. If a longer warranty matters most to you, SaunaBoxers offers one year.
Cooling briefs vs. DIY cooling
Plenty of men start with an ice pack or a frozen towel before buying anything. It's a reasonable test of whether cooling suits you, but it's hard to keep up.
| Method | Hands-free | Stays in place | Skin barrier | No dripping |
|---|---|---|---|---|
| Loose ice pack | No | No | Only if wrapped | No |
| Frozen wet towel | No | No | No | No |
| Cooling briefs with zip pouch | Yes | Yes | Yes | Yes |
How to get the most from cooling briefs
Even the best cooling underwear works better with a simple routine. These habits keep cooling consistent from session to session:
- Refreeze straight away. Put the used insert back in the freezer as soon as you finish, so the second one is always ready.
- Wear the right size. A snug fit keeps the pouch beneath the testes. Too loose, and the insert sits too low.
- Sit lower on long sessions. Heat rises, so the lower bench is gentler on you and on the insert.
- Wash after every session. Remove the insert first and follow the care label.
- Carry inserts in an insulated case if your sauna is away from home.
Who should choose SaunaArmor?
SaunaArmor suits men who sauna regularly and want cooling to be part of every session without thinking about it. It's a good fit if you:
- Sauna two or more times a week and want to reduce heat to the testes.
- Plan to have children now or later and want to keep the sauna in your routine.
- Prefer cotton over synthetic fabrics against your skin.
- Use a gym or public sauna, where holding an ice pack isn't practical. The insulated travel case keeps up to eight inserts frozen for up to four hours.
If you only sauna occasionally, you may not need dedicated gear. If you're trying to conceive, talk to a doctor about your heat exposure as well.
Frequently asked questions
What is the best cooling underwear for sauna use?
Look for a breathable cotton body, a closed pouch that holds the cooling beneath the testes, a fabric barrier between the insert and your skin, and at least two inserts. SaunaArmor was designed around all four.
Do cooling briefs protect fertility?
Research links repeated sauna heat to temporarily lower sperm quality, and cooling during the session reduces heat at the source. No study has yet tested cooling underwear on sperm outcomes directly, so treat it as a practical way to reduce exposure rather than a guarantee.
How long does a cooling insert last in the sauna?
SaunaArmor inserts are designed for one session of about 30 minutes. With two per pair, you can use one while the other refreezes.
Can I wear cooling briefs in an infrared sauna?
Yes. Infrared saunas run at lower air temperatures than traditional saunas, but they still raise your body temperature over a session. The insert will usually last longer at the lower air temperature, and the pouch keeps it in place the same way.
Is SaunaArmor the same as other "Sauna Armor" products?
No. SaunaArmor is made by Sauna Protocol and sold at saunaprotocol.co. Some products use similar names, so check the seller before you buy.
The bottom line
Cooling underwear only earns its place if it works on a hot bench for a full session. Compare any pair on fabric, placement, how the cold is held, the skin barrier and what's included. SaunaArmor was built to answer each of those for sauna use specifically.
Browse the full Sauna Protocol range or read why we started.
Shop SaunaArmor cooling briefs
This article is for general information only and is not medical advice. If you have concerns about your fertility, speak with a doctor.