Education guide

Hard-Shell vs. Soft-Shell Hyperbaric Chambers: A Plain-Language Comparison

Last reviewed: May 20, 2026

The two main kinds of hyperbaric chamber differ in pressure, the oxygen they deliver, how they're regulated, and what they cost. Here's a clear, balanced comparison to help you understand the landscape before you choose a provider.

This article is general information, not medical advice. It does not recommend hyperbaric oxygen for any condition. Speak with a physician about whether hyperbaric oxygen is appropriate for you.

Hard-Shell vs. Soft-Shell Hyperbaric Chambers: A Plain-Language Comparison

If you’ve started looking into hyperbaric oxygen, you’ve probably noticed that “hyperbaric chamber” can mean two quite different things. There are rigid, clinic-grade hard-shell chambers, and flexible, portable soft-shell (often called “mild”) chambers. They look different, they work at different pressures, they’re regulated differently, and they’re used by different kinds of providers for different reasons.

This guide lays out those differences plainly so you can understand what you’re actually looking at. It doesn’t recommend hyperbaric oxygen for any health condition — that’s a conversation for you and a physician.

The short version

ATA = “atmospheres absolute,” a measure of pressure. 1.0 ATA is normal pressure at sea level; 1.3 ATA is roughly the pressure you’d feel a few metres underwater.

Pressure: the core difference

Pressure is the single biggest difference between the two.

Hard-shell chambers are built to reach roughly 2.0 to 3.0 ATA [1][2]. Clinical hyperbaric medicine generally operates in the 2.0–2.4 ATA range for standard protocols [4].

Soft-shell (“mild”) chambers operate at lower pressures, generally around 1.3 to 1.5 ATA [2][3]. The flexible construction is what limits them to this gentler range.

Higher pressure allows more oxygen to dissolve into the bloodstream, which is why clinical hyperbaric medicine uses the higher-pressure hard-shell chambers [1]. The mild, soft-shell range is a meaningfully different physical experience.

Oxygen: concentration matters as much as pressure

The two chamber types also typically differ in the oxygen they deliver.

Hard-shell clinical chambers are designed to deliver up to 100% medical-grade oxygen under pressure [1][3]. Soft-shell chambers more commonly use room air or oxygen enriched by a concentrator, at lower concentrations than pure medical oxygen [2][3].

This is why “mild hyperbaric” is sometimes described as a low-pressure, lower-oxygen experience compared with clinical hyperbaric oxygen — both the pressure and the oxygen concentration are lower.

Construction and configuration

Hard-shell chambers are rigid, built from high-strength steel or medical-grade acrylic composite, and are engineered to last for decades [1]. They come in two configurations: monoplace, which holds one person, and multiplace, which can hold several people (and sometimes an attendant) at once [4].

Soft-shell chambers are made of flexible materials such as reinforced vinyl or polyurethane. They’re highly portable — they can even be deflated for storage or transport — which makes them practical for wellness studios, athletic settings, and home use [1].

How each is regulated in Canada

This is the part most people don’t realize, and it matters.

Health Canada has issued medical-device licences for hyperbaric chambers to treat only the 14 conditions recognized by the Undersea and Hyperbaric Medical Society (UHMS) — things like decompression sickness, carbon monoxide poisoning, certain non-healing wounds, and radiation tissue injury [5]. Health Canada has not licensed hyperbaric chambers for other uses, and advises caution toward anyone advertising hyperbaric oxygen to treat conditions outside that list [5].

In practice, the higher-pressure, physician-supervised treatment for those 14 conditions happens in hard-shell clinical chambers, typically in hospitals or accredited clinics. In Alberta, for example, physician-provided hyperbaric facilities are accredited by the College of Physicians & Surgeons of Alberta (CPSA) [6].

Soft-shell mild chambers are generally offered as wellness or relaxation experiences rather than licensed medical treatments. They are not licensed by Health Canada for general wellness or for treating medical conditions [5]. (For reference, in the United States the FDA has cleared mild chambers only for acute mountain sickness, and clears hard-shell hyperbaric oxygen for the recognized list of conditions [3][4].)

The takeaway: the chamber type is closely tied to its regulatory status and the kind of provider that operates it.

What each tends to be used for

• Hard-shell, clinical: physician-supervised treatment of the recognized conditions, in hospitals and dedicated clinics [4][5].
• Soft-shell, mild: wellness centres, athletic recovery, and home users seeking general relaxation and recovery time — not a licensed medical treatment [2][3].

A balanced note on evidence: the research base for high-pressure clinical hyperbaric oxygen in its approved indications is well established, which is why those uses are licensed [5]. The evidence for mild, soft-shell hyperbaric at 1.3–1.5 ATA for general wellness purposes is far more limited, and claims in this area should be read critically. If a provider promises that any chamber will treat or cure a specific condition outside the recognized list, that’s a reason for caution — and a good question to raise with a physician [5].

What it costs in Canada

Costs vary by chamber type, setting, and region, and many providers price by package or membership. As a general pattern, clinical hard-shell sessions tend to cost more than mild soft-shell wellness sessions. For current pricing, check directly with providers — our cost guide and the provider listings show ranges where they’re publicly available.

How to choose a provider

A few questions worth asking, whichever type you’re considering:

• Is it a hard-shell or soft-shell chamber, and what pressure (ATA) does it run at?
• Is the session physician-supervised, or self-directed?
• Is the facility accredited (for clinical providers)?
• What does the provider actually claim — and does it match what Health Canada recognizes?
• Are there reasons I shouldn’t use a chamber? (See our safety guide.)

Use the provider directory to compare facilities near you by chamber type, setting, and location.

References

1. Hyperbaric Medical Solutions — “Types of Hyperbaric Chambers.” https://www.hyperbaricmedicalsolutions.com/blog/types-of-hyperbaric-chambers
2. Industry comparison overviews of hard-shell vs. soft-shell chambers (pressure and oxygen ranges). e.g. National Hyperbaric — “Difference between hard and soft hyperbaric chambers.” https://www.nationalhyperbaric.com/hyperbaric-oxygen-therapy/difference-hard-soft-hyperbaric-chambers
3. Oxygen Health Systems — “The Complete Guide to Choosing a Hyperbaric Chamber.” https://www.oxygenhealthsystems.com/the-complete-guide-to-choosing-a-hyperbaric-chamber-for-your-clinic/
4. Atlanta Hyperbaric Center — “Types of Hyperbaric Chambers” (monoplace vs. multiplace; clinical pressure ranges). https://atlantahyperbariccenter.com/blog/types-of-hyperbaric-chambers/
5. Health Canada — “Hyperbaric Oxygen Therapy” (licensed conditions; caution on unproven claims). https://www.canada.ca/en/health-canada/services/healthy-living/your-health/medical-information/hyperbaric-oxygen-therapy.html
6. College of Physicians & Surgeons of Alberta (CPSA) — “Hyperbaric Oxygen Therapy” (facility accreditation). https://cpsa.ca/facilities-clinics/accreditation/hyperbaric-oxygen-therapy/

All sources accessed May 2026. Figures for pressure and oxygen concentration are typical ranges and vary by manufacturer and model; verify specifics with the chamber manufacturer or provider. Before publishing, have the health content reviewed (ideally by a clinical reviewer) per the site’s editorial standards.