What is hyperbaric oxygen therapy (HBOT)?

Hyperbaric oxygen therapy — usually shortened to HBOT — means breathing oxygen inside a sealed chamber held above normal atmospheric pressure. It is one of the fastest-growing categories in home wellness and clinical recovery, yet the core idea is simple: combine pressure with concentrated oxygen so the body can take in more oxygen than ordinary breathing allows.

This guide explains how HBOT works, what happens during a session, the difference between soft and hard chambers, and how to choose a system whether you are buying for a home, a clinic or your own brand.

The science in one paragraph

At sea level you breathe air that is roughly 21% oxygen at one atmosphere absolute (1 ATA). A hyperbaric chamber raises the pressure around you — typically to between 1.3 and 2.0 ATA — while an oxygen concentrator raises the concentration you breathe toward 93% or higher. Under increased pressure, more oxygen dissolves directly into the blood plasma instead of relying only on red blood cells. Many people build a wellness routine around that increased oxygen availability.

Soft vs hard chambers: the two families

Almost every chamber on the market falls into one of two families. The right one depends mostly on the pressure you want and whether it is for home or professional use.

Soft chambers (often called mild hyperbaric therapy, or mHBOT) are portable, foldable systems built from medical-grade TPU with airtight zippers and an internal frame. They typically run at 1.3–1.5 ATA, install in a spare room and are operated by one person. Our soft lying and soft sitting ranges cover this category — including professional 2.0 ATA portable models such as the COSL20.

1.5 ATA · Soft Lying Chambers COSL15 — Soft Lying Hyperbaric Chamber Premium portable lying chamber for daily home wellness and recovery. View COSL15 details →

Hard-shell chambers are rigid carbon- or stainless-steel systems that reach up to 2.0 ATA, with integrated oxygen, climate control and dual control panels. They are the workhorse of clinics and premium facilities. Compare single-person and multiplace hard-shell systems to see the range.

1.5–2.0 ATA · Single-Person Hard Shell COHT20 — Single-Person Hard Shell Chamber Q355 carbon-steel sitting chamber with integrated oxygen system. View COHT20 details →

How the two families compare at a glance

If you are weighing the two, our dedicated soft vs hard-shell comparison goes deeper on construction, cost and installation.

What a session actually feels like

You step into the chamber, seal it, and it gently pressurizes over a few minutes — a sensation similar to a slow aircraft descent, eased with simple ear-equalization. At pressure you breathe concentrated oxygen through a comfortable mask. A typical session lasts 60–90 minutes; most people read, stream, meditate or simply rest. The chamber then returns to normal pressure and you step out. For a full walk-through, see what to expect during a session.

Who uses hyperbaric therapy

• Home users building a daily wellness and recovery routine — see chambers for the home.
• Athletes and recovery studios adding it to training and sleep — see chambers for athletes.
• Wellness centers and spas offering it as a premium service — see chambers for wellness centers.
• Clinics and rehabilitation facilities — see chambers for clinics and for rehabilitation.
• Veterinary hospitals treating companion and large animals — see veterinary chambers.

How to get started

If this is your first chamber, a 1.3–1.5 ATA soft model is the comfortable, popular starting point; the COSL15 for lying sessions and the COSE15 for a more spacious sitting cabin are both easy first systems. If you are equipping a clinic or want clinic-grade 2.0 ATA pressure, look at the COHT20 or a multiplace COHB20. Our buyer's guide walks through every decision step by step.