How to choose drysuit undergarments

When selecting undergarments for a drysuit, divers typically consider factors such as insulation, moisture management, and comfort. Here's how undergarments with different weight specifications (measured in grams per square meter, g/m²) may differ for drysuit diving:

  1. Undergarments Less than 200g/m²:

    • Material: Lightweight and breathable fabrics such as thin fleece, polyester blends, or moisture-wicking materials.
    • Water Temperature: Typically suited for warmer waters, such as those above 20°C (68°F).
    • Insulation: Provides minimal insulation, suitable for warm-water diving or as a base layer in moderate temperatures.
    • Moisture Management: Focuses on wicking away moisture to keep the skin dry and prevent overheating during activity.
    • Comfort: Offers excellent flexibility and freedom of movement, ideal for activities requiring agility underwater.
    • Suitability: Ideal for use in tropical or temperate waters where additional insulation is not required, or as a base layer under thicker undergarments in colder conditions.
  2. Undergarments Around 300g/m²:

    • Material: Medium-weight materials like polar fleece or thicker polyester blends.
    • Water Temperature: Suitable for waters ranging from approximately 10°C to 20°C (50°F to 68°F).
    • Insulation: Provides moderate insulation suitable for cooler water temperatures or longer dives.
    • Moisture Management: Balances insulation with moisture-wicking properties to regulate body temperature and prevent overheating or chilling.
    • Comfort: Maintains flexibility while offering increased warmth compared to lighter options, suitable for a wide range of diving conditions.
    • Suitability: Suitable for temperate or cooler waters where maintaining core body temperature is important, offering a balance between warmth and flexibility.
  3. Undergarments Over 400g/m²:

    • Material: Heavyweight materials designed for maximum insulation and warmth, such as thick polar fleece or high-density synthetic fibers.
    • Water Temperature: Best suited for cold-water diving conditions, typically below 10°C (50°F).
    • Insulation: Provides superior warmth and thermal protection, ideal for cold-water diving or extended exposure to low temperatures.
    • Moisture Management: Focuses on retaining body heat while efficiently managing moisture to prevent overheating or chilling.
    • Comfort: Offers excellent insulation but may slightly restrict flexibility compared to lighter options, especially in thicker suits.
    • Suitability: Primarily used in cold-water diving environments where maintaining core body temperature is critical for safety and comfort, providing optimal warmth and protection against the elements.


In summary, the weight of drysuit undergarments influences their insulation, flexibility, and suitability for various diving conditions. Divers should choose undergarments based on the specific temperature, depth, and duration of their dives to ensure optimal comfort and safety underwater.

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