What to Wear in a Hyperbaric Chamber: Understanding the Safety Basics

When preparing for a session, knowing what to wear in a hyperbaric chamber is not just a matter of comfort—it’s a critical safety requirement. Hyperbaric oxygen therapy (HBOT) involves being in a pressurized environment, which significantly increases the risk of fire due to elevated oxygen levels. Standard clothing materials like synthetic fibers, polyester, or nylon can generate static electricity or trap oxygen, making them flammable. As a rule, the safest attire is 100% cotton, as it is breathable, static-free, and less likely to ignite under pressure. For comprehensive guidelines on appropriate attire, please refer to What To Wear In A Hyperbaric Chamber. This foundational knowledge ensures your session is both effective and secure.

Key Clothing Rules for Fire Safety in Oxygen-Enriched Environments

The primary rule for anyone wondering what to wear in a hyperbaric chamber is to avoid synthetic materials at all costs. Polyester, spandex, and wool are highly discouraged because they can create sparks from friction or melt onto the skin in a fire. Cotton is the gold standard—look for 100% cotton scrubs or hospital-approved garments. Additionally, avoid wearing any items that contain metal, such as zippers, buttons, or underwire bras, as they can produce sparks or cause discomfort during compression. Jewelry, watches, and hair clips must also be removed. By following these material guidelines, you reduce the risk of static discharge and ensure compliance with safety protocols. The key is to prioritize natural fibers and simple designs that minimize fire hazards.

Clothing Restrictions: Items to Exclude for Optimal Safety

Beyond material choice, specific clothing items should never be worn inside a hyperbaric chamber. Items like tight-fitting jeans or thick jackets can restrict blood flow or trap air pockets, leading to discomfort or potential injury during pressure changes. Loose-fitting garments are preferable, but they must not have drawstrings or ties that could catch on chamber equipment. Underwear made from cotton or a cotton blend is acceptable, but avoid thongs with synthetic waistbands. Footwear is typically prohibited—most centers require you to wear cotton socks or go barefoot to minimize static buildup from carbon soles. Always ask your technician for a checklist of allowed items before your session.

Comfort Considerations for Extended Hyperbaric Sessions

While safety is the top priority, comfort plays a vital role in the success of your HBOT session, which can last 60 to 120 minutes. After confirming what to wear in a hyperbaric chamber from a safety perspective, focus on practical comfort. Choose a soft, 100% cotton t-shirt and sweatpants without waistband elastic—many chambers provide disposable cotton garments to ensure consistency. Layers are not recommended, as temperature control inside the chamber varies; cotton helps regulate body heat. Avoid any clothing with printing that contains metallic flakes, glitter, or foil designs. Many patients find that wearing a simple hospital gown over their own cotton clothes offers an extra layer of protection while maintaining ease of movement.

Accessory Limits: Removing Non-Cotton Items Before Entering

Accessories are strictly regulated in hyperbaric therapy. Do not wear items like hair ties with metal fasteners, plastic headbands, or eyeglasses (unless specifically designed for pressure environments). Contact lenses can cause eye dryness under pressure, so consider removing them beforehand. For hair,