The Cold, Hard Truth: Ice Bath vs Cryotherapy (and Which Sauna Really Wins)

Ice bath vs cryotherapy, infrared or Finnish sauna? After 30 years in spas, here's what the research actually says, what nobody tells you about staff, and why I'd never tell every guest to jump in.

Hardly a week goes by without an owner asking me for an ice bath. Usually right after they've watched someone on Instagram climb into a wheelie bin full of ice. The wish list normally carries on: an infrared sauna because the members keep asking, and a cryotherapy chamber, because why not?

I get it. Heat and cold are visible, people talk about them, and a good thermal journey earns money without tying up a therapist for an hour. I've built thermal into spas from Ireland to the Maldives and I'm a believer. But I've also seen what happens when it goes in because it's on trend rather than because it suits the guests, the space and the team. So here's the honest version.

The heat: infrared sauna vs Finnish sauna

If I can only put in one heat experience, it's a traditional Finnish sauna. Every time. It runs at 80 to 100°C, guests control the intensity with the water ladled over the stones), and it has the best science of anything in thermal. Long-running Finnish studies link regular sauna use with lower cardiovascular risk and lower all-cause mortality. It's association rather than proof, but nothing else comes close.

The catch? That heat puts some guests off, especially first-timers and many women going through menopause. It also needs energy, ventilation and proper maintenance.

Infrared warms the body directly rather than the air, so the cabin sits at a much kinder 45 to 65°C. You sweat, you relax, and you don't feel like you're being slow-roasted. It's compact, cheaper to run and brilliant for urban spas, gyms and residences. The evidence is thinner though, and the market is full of detox and weight-loss claims I'd never write on a spa menu.

So which wins? Neither, really. In a resort, the Finnish sauna is your anchor. In a compact city site, a good infrared cabin is often the smarter call. Where you have space for both, guests find their own level, which is what Wellness Your Way is all about.

The cold: ice bath vs cryotherapy, dry cold or wet cold?

This is the one owners ask me most. Cryo is dry air at minus 110°C. An ice bath is water at around 8 to 10°C. Surely the colder one works harder?

Not really. Water pulls heat out of the body roughly 20 to 25 times faster than air, which is why a cryo chamber has to be so extreme just to keep up.

The research backs this up. When four minutes of cryo at minus 110°C was compared with four minutes in 8°C water, cryo cooled the skin far more (around 12°C against 8°C). But muscle and core temperature, which is what any recovery claim really depends on, dropped by about the same amount. If anything, the water cooled the muscle slightly more (Costello et al., 2012).

For recovery after hard exercise, the ice bath came out moderately ahead in a head-to-head study: better jump performance, less soreness, and people felt more recovered (Abaïdia et al., 2017). It was a small study, so I treat it as a pointer. But the wider evidence agrees. A 2022 review found cold-water immersion is an effective recovery tool after high-intensity exercise (Moore et al., 2022), while the Cochrane review of whole-body cryotherapy found too little good research to say whether it helps soreness at all (Costello et al., 2015).

So the case for cryo is the experience, not the results. It's three minutes, guests stay dry, and they get to stand in a fog dressed for a polar expedition in their underwear. Fun? Absolutely. Better? No. A well-run ice bath does at least as well for a fraction of the cost, which is why I rarely advise cryo as a first investment.

One thing the ice bath fans on social media rarely mention: plunging straight after strength training may blunt your muscle gains. Timing matters.

And what about your skin?

I hear two claims all the time: that ice baths age the skin, and that cryo tightens it. Sorry, no miracle facelift in a freezer.

Any cold, wet or dry, narrows the blood vessels, so skin looks tighter and less puffy for a while. Then it warms up and goes back to normal. The one recent study on cryo and skin did show some improvement in firmness, but it was tiny, had no group that skipped cryo to compare against, and found the skin lost more water after the course (Dzidek et al., 2025). And I found no evidence that ice baths age the skin.

What is true is that repeated cold can irritate sensitive skin. Guests with rosacea or very sensitive skin should go gently with both.

At a glance

	Finnish sauna	Infrared sauna	Ice bath	Cryotherapy
Temperature	80–100°C	45–65°C	Approx. 3–15°C water	Below −110°C air
Evidence	Strongest	Emerging	Good for recovery	Weakest
Cost to install	Medium	Low–medium	Low–medium	High
Supervision	Moderate	Low	High	Very high

Is cold plunging and sauna safe for everyone?

No. And our industry needs to say that out loud more often.

Heat and cold work because they stress the body. For a healthy adult, that can be energising. For others, it's a risk. Anyone who is pregnant, has a heart condition or uncontrolled blood pressure, or a circulatory condition such as Raynaud's should check with their doctor first. And nobody should use either after a few drinks, however good the sunset bar was.

My non-negotiables are simple:

1. Screen every guest before their first session.

2. Guide, don't just provide. Explain how to go in, how long to stay and when to come out.

3. Start gently with first-timers and build up over visits.

4. Make saying no normal. Skipping the ice bath is not failing the spa.

5. Keep the claims honest. Not detox, not fat loss, not cures.

For me, Wellness for All doesn't mean everything for everyone. A woman in menopause may find the Finnish sauna overwhelming but love a gentle infrared session and a cool shower. A runner may want the plunge, just not straight after heavy weights. It means the right thing for each guest.

The gap nobody budgets for: staff training

This is the part that worries me most. Owners will happily spend serious money on a sauna and an ice bath, then hand it to a team that has never been trained to run it. It's like buying a Ferrari and giving the keys to a learner driver.

Ask the team in many thermal suites a few simple questions. How long should a first-timer stay in the ice bath? Who shouldn't use the sauna? What do you do if a guest feels faint coming out of the cold? Too often, nobody can answer with confidence. Our therapists are brilliant at touch, but most were never taught thermal physiology. That's not their fault. It's ours.

A thermal suite without knowledgeable people isn't a wellness facility. It's a risk. Every team needs proper training in:

• Screening, contraindications and the confidence to say "not today"

• How the body responds to heat and cold, including the cold-shock response

• Personal protocols for first-timers, regulars, athletes and women in menopause

• Spotting trouble, first aid and a practised emergency procedure

• Daily water hygiene, temperature logs and equipment checks

• Talking honestly about the evidence

Then keep it going, with refreshers, new starters signed off before they work alone, and someone senior who owns the thermal area. And there's a commercial upside: a team that understands thermal sells it with confidence, guides guests into a full thermal journey and lifts your guest spend per hour without adding to payroll.

My advice to spa owners

Start with the guest, not the equipment. If I could only build one thing, it would be a Finnish sauna, an ice bath and a proper relaxation room. The classic circuit, with the best evidence and the most loyal following. Add infrared where the space or your guests call for gentler heat. Treat cryo as a specialist extra, not a must-have.

Then invest as much in training your people as you do in the hardware. Our job isn't to push everyone into the ice. It's to help each guest find what's right for them, and to have the confidence to tell them when it isn't.