You must wear 100% cotton clothing. In a high oxygen environment, any synthetic fiber is an extremely dangerous fire hazard.
In order to ensure absolute safety and conform to clinical operation specifications, most professional hyperbaric oxygen centers will provide you with 100% pure cotton brush hand clothing or patient clothing certified by the hospital. If personal clothing is allowed at the center, these must also be loose-fitting, with no metal zippers, buttons or undergarment rims, and must be verified on site by a technician for cotton composition. This is mainly to prevent the accumulation of static electricity-in the cabin, even a very small spark of static electricity, the consequences can be very serious.
In addition to clothes, you also need to enter the cabin in a “clean skin” state. This means that perfume, deodorant, hair spray or oil-containing cosmetics/lotions cannot be applied. In addition, all jewelry, watches and electronic devices must be removed and stored in a safe locker before treatment.

Why is 100% cotton so important in hyperbaric oxygen therapy?
Safety is the cornerstone of hyperbaric oxygen therapy. Since the oxygen chamber is pressurized and the oxygen concentration is extremely high, the entire environment is extremely sensitive to combustion reactions.
Synthetic materials like polyester, nylon or spandex are very prone to static electricity. In a high oxygen environment, a little static spark may cause a fire. That’s why 10% is an “insurmountable” standard; cotton fibers do not carry an electrostatic charge as easily as synthetic blends and are the safest option for patients.
Special Clothing Provided By The Hospital
In order to completely eliminate the risk of misjudgment of the fabric composition, many clinical institutions require patients to wear the clothing provided by the center. There are several considerations for this:
- Safety and security: These garments are 100% cotton certified and cleaned by a professional laundry room to ensure there are no chemical residues.
- Comfort: This kind of clothes is designed to be very loose. After all, a single treatment usually takes 60 to 90 minutes, and good blood circulation and wearing comfort are very important.
- Standardization: Uniform wear ensures that no metal components (such as invisible zippers or snaps) are accidentally brought into the cabin.
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What Do You Need To Follow If You Wear Your Own Clothes?
If your center allows you to bring your own clothes, you must cooperate with the extremely strict inspection process. Clothes must meet the following criteria:
- Fabric verification: The label must be clearly marked “100% Cotton”. Even a very small percentage of elastic or synthetic fibers is a violation.
- No metal parts: Do not wear clothing with metal zippers, buttons, rivets or steel rings. Metals under pressure may produce triboelectrification or other reactions.
- Loose style: with the pressure changes, tights will make you feel very uncomfortable. Therefore, loose cotton trousers and T-shirt is the best solution.
“Clean Skin” Principle
Before entering the hyperbaric oxygen chamber, you must not leave any chemical products on the surface of your skin. You must avoid the following items:
- Oil-based products: Cosmetics, lotions and ointments containing oil or petroleum jelly are highly flammable in a hyperbaric oxygen environment.
- Fragrances and sprays: Perfumes, colognes, hair sprays and deodorants release volatile organic compounds that are not safe in confined, pressurized spaces.
- Hair accessories: Make sure there are no hairpins, hairpins or hair accessories containing metal or synthetic fibers on your hair.
Prohibited Items And Electronic Products

To ensure patient safety and equipment integrity, the following items are strictly prohibited from being brought into the cabin:
- Electronics: Mobile phones, tablets, smart watches, and even battery-operated hearing aids must be removed. The pressure in the cabin can damage the battery or internal components of the device, and even cause an explosion or fire risk.
- Jewelry and watches: All jewelry, including rings, necklaces and watches, should be stored in a cabinet.
- Prostheses and medical devices: If you wear any external medical device, you must inform the technician in advance, and we will judge whether the device meets the “hyperbaric oxygen safety certification”.
Following these strict guidelines for dressing and preparation is to ensure that your treatment is both safe and effective. Before the first treatment, please be sure to consult your hyperbaric oxygen technician to confirm the specific implementation process of the center.
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