What you wear under a drysuit helps determine how warm and comfortable you remain during a dive. Unlike a wetsuit, a drysuit is designed to keep water out; insulation usually comes from the undergarments and the air space managed within the suit. The right layers depend on water temperature, dive duration, activity, suit design, and your own cold tolerance.
Start with the manufacturer’s guidance
Drysuit systems vary. Check the suit and undergarment manufacturer’s recommendations and get drysuit-specific training. The fit of your undergarments must work with the suit’s seals and mobility, and bulky layers can interfere with movement or gas management.
Choose layers for the conditions
- Base layer: A close-fitting moisture-managing layer can help move perspiration away from the skin. Synthetic or suitable wool fabrics are common options.
- Insulating layer: Fleece or purpose-made drysuit undergarments trap insulating air. The amount of insulation should match the water temperature and planned exposure.
- Accessories: Suitable socks, gloves, and head protection may be important, depending on the drysuit system and conditions.
Avoid overheating and restricted movement
More clothing is not always better. Overly thick layers can restrict movement, compress in use, or make it harder to manage the suit comfortably. Divers can also become too warm before entering the water, especially while gearing up in hot weather. Dress for the dive, manage surface heat sensibly, and follow your instructor’s guidance.
Can you wear ordinary clothes?
Some ordinary garments may be usable in particular circumstances, but cotton clothing can retain moisture and may be uncomfortable when damp. Everyday clothes may also bunch up, restrict movement, or provide less predictable insulation than purpose-designed undergarments. Use a layering system appropriate to the suit and conditions rather than assuming normal clothes are adequate.
Fit and maintenance
Check that base layers do not bunch at the wrists, ankles, neck, or seals. Keep garments clean and fully dry between dives, and inspect the drysuit seals, zipper, valves, and other components according to the manufacturer’s instructions. Follow your training for buoyancy control and suit-gas management.
Bottom line
Choose drysuit layers for insulation, moisture management, and freedom of movement. The best combination depends on the environment and the specific suit—not a universal clothing list. Ask a qualified drysuit instructor or reputable supplier to help match your layers to the conditions.
Choosing drysuit undergarments for diving
The purpose of a drysuit base layer is to move moisture away from the skin and help maintain a comfortable insulating layer. The right combination depends on water temperature, dive duration, activity level, drysuit fit, and whether the suit is membrane or neoprene. A bulky undergarment can restrict movement or compress in a way that reduces insulation, while a thin layer may not provide enough warmth for cold conditions.
Layering without restricting movement
Start with a comfortable moisture-managing base layer and add insulation designed for diving as conditions require. Avoid cotton garments that stay damp and cool against the skin. Try the complete combination with the drysuit before the trip: check shoulder movement, access to valves, ability to reach equipment, and that nothing bunches under seals. Follow the suit and undergarment manufacturers’ recommendations.
Practice and maintenance
Drysuit diving requires training because trapped gas affects buoyancy and can migrate around the suit. Do not treat clothing choice as a substitute for drysuit instruction. Rinse the suit, inspect seals and zippers, and wash undergarments according to their care labels after diving. If you are cold despite appropriate layers, review the fit, exposure plan, and dive duration with a qualified instructor.