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Drysuit Undergarments

Drysuit Undergarments

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Buy drysuit undergarments in Canada — full-body undersuits, tops, pants, socks, and glove liners designed to be worn inside a drysuit for thermal insulation during cold water scuba diving. The undergarment is where all of a drysuit's warmth comes from — the drysuit itself only keeps you dry. We carry undergarments in a range of thicknesses and materials suitable for Canadian water temperatures from cool summer lakes through near-freezing winter and ice diving conditions. When purchasing a new drysuit, always be fitted while wearing the thickest undergarment combination you plan to use. 

  • On Sale
    FIT GUARANTEE!
    Scubapro K2 Extreme one-piece undersuit Scubapro K2 Extreme one-piece undersuit - back view
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    Scubapro K2 Extreme Underwear - Unisex

    Scubapro

    $589.99
    $649.99
    FIT GUARANTEE! This item qualifies for our fit guarantee. Enjoy free shipping on your first sizing exchange! Stay warm even in the most extreme cold water diving environments.  Features: One-piece design  Stretchy, breathable dual fleece...
    4308
    $589.99
    $649.99
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  • On Sale
    DUI XM450 Socks DUI XM450 Socks - Size Chart
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    DUI XM450 Socks

    DUI

    $149.49
    $199.00
    Water Temperature Range: 28-45 FMaterial: Thinsulate Ultra Insulation 400 gram and Polartec PowerStretch Pro560 gram/m2 at ankles for warmth and comfortUse: Primary layer for very cold waterUnisex Sizes: XS, S, M Other...
    1529
    $149.49
    $199.00
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  • Venture Heated Vest Pro V3 - Dry/Wet Venture Heated Vest Pro V3 - Can be worn under Wet suit or dry suit
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    Venture Heated Vest Pro V3 - Dry/Wet

    Venture Heat

    $1,299.00
    Stay warm while scuba diving in cold water while wearing a wetsuit or drysuit with the Venture Heat Pro vest. Also adds an extra layer of warmth when diving in warm water when the water is cool. Great for other outdoor activities as well like kayaking,...
    4688
    $1,299.00
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  • Scuba Force Fleece Glove Scuba Force Fleece Glove for dry glove
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    Scuba Force Fleece Glove

    Scuba Force

    $35.00
    High quality fleece glove liner to wear under a dry suit glove.  Features: Maintain good dexterity while wearing dry gloves Use as a glove liner under marigold gloves, PSI press lock gloves, and any other system of drysuit dry...
    5209
    $35.00
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  • Scuba Force X-Sleeve
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    Scuba Force X-Sleeve Wrist Warmer (pair)

    Scuba Force

    $49.00
    Extra warmth on your wrists and hands while drysuit diving with any dry glove system. Features: Made of full stretch power fleece for maximum warmth Wear with drygloves under your wrist seals to assist in air circulation between your gloves &...
    4794
    $49.00
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  • DUI XM450 Jumpsuit DUI XM450 Jumpsuit - Size Chart
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    DUI XM450 Jumpsuit (v1)

    DUI

    $895.00
    Water Temperature Range: 28-45 FMaterial: Combination of Thinsulate Ultra 400 Insulation Type BZ with Polartec PowerStretchUse: Primary layer for very cold waterMen’s Sizes: XS, S, M, MT, L, LT, XL, XLT, XXL, 3XL, 4XL Other...
    5180
    $895.00
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What to know about drysuit undergarments

The undergarment is your insulation — choose it carefully
A drysuit's job is to keep water out. Your undergarment's job is to keep you warm. The two systems work together — and the undergarment is the variable you adjust for conditions. A light 100 to 200 gram fleece undergarment suits cooler but not cold conditions, such as summer lake diving in Alberta above 12°C. A 300 to 400 gram mid-weight suit is the most versatile choice for spring and fall Canadian diving between 6°C and 12°C. A heavy expedition-weight undersuit of 600 grams or more is used for near-freezing water, ice diving, or long dives in cold conditions. Many drysuit divers own two weights and layer them as needed.

Material — avoid cotton entirely
Fleece, wool, and synthetic materials retain their insulating properties even if they become slightly damp — which can happen from perspiration inside a drysuit. Cotton does neither: it absorbs moisture, loses all insulating value when wet, and dries slowly. Cotton undergarments inside a drysuit can result in dangerous heat loss even on a mild dive. Always use undergarments specifically designed for drysuit use. Purpose-built drysuit undersuits use compressed cell or open-cell foam insulation, thinsulate, or technical fleece specifically engineered to insulate efficiently in the confined, moist environment inside a drysuit.

Undersuit fit — room to move without excess bulk
A drysuit undergarment should fit comfortably without restricting movement at the shoulders, knees, and elbows. Too tight and it will compress the insulation — reducing its effectiveness and restricting your range of motion. Too loose and it will bunch under the drysuit and create uncomfortable pressure points during a dive. Most undersuits are sized in S/M/L/XL based on height and chest measurement. If you are between sizes, sizing up is generally better for warmth; sizing down is better for mobility but may compromise insulation thickness. Try the undersuit on with your drysuit before purchasing if possible.

Layering — base layer, mid layer, and oversuit
For the coldest conditions, most experienced drysuit divers use a layered system: a thin moisture-wicking base layer against the skin to manage perspiration, a mid-layer fleece for primary insulation, and in extreme cold an additional oversuit layer. This system is more versatile than a single heavy undersuit because layers can be added or removed to match conditions precisely. Undersuit socks and glove liners extend the thermal system to your extremities and are particularly important for Canadian ice diving where hand and foot warmth are often the first limitation.

Frequently asked questions

How do I know what thickness of undergarment I need for Canadian diving?

Water temperature is the primary guide, but individual cold tolerance varies significantly. As a general starting point: above 15°C, a light 100 to 200 gram fleece is typically comfortable for dives up to 60 minutes. From 8 to 15°C, a 300 to 400 gram mid-weight undersuit is appropriate for most divers. Below 8°C and for ice diving, a heavy expedition-weight 600 gram or heavier undersuit is recommended, often layered with a base layer and possibly additional insulation at the torso. New drysuit divers consistently underestimate how cold they will get — when in doubt, add a layer. You can always vent a little extra air; you cannot add warmth once you are underwater.

Can I wash my drysuit undergarment in a regular washing machine?

Most drysuit undersuits can be machine washed on a gentle cycle with cold water and mild detergent — check the care label on your specific garment before washing. Avoid fabric softener, which coats the fibres of technical fleece and reduces its ability to wick moisture. Do not tumble dry on high heat — heat damages compressed cell foam insulation and can cause undersuit materials to shrink or deform. Air dry or tumble dry on low. Store the undersuit loosely folded or hung — compressing it in a tight stuff sack for extended periods can permanently damage the insulation structure.

Do I need separate undergarment socks and glove liners?

For most Canadian diving, yes — feet and hands are frequently the first areas where divers feel the cold, and standard drysuit integrated socks with wet gloves may not provide enough protection in near-freezing water. Undersuit socks worn inside the drysuit neoprene socks add a meaningful layer of insulation at the feet. Glove liners worn inside dry gloves (or under wet gloves in milder conditions) extend your comfortable dive time considerably. For ice diving, dedicated undersuit socks and glove liners are essentially mandatory for any dive longer than 20 to 30 minutes.

Should I buy my drysuit and undergarment at the same time?

Yes — and more importantly, you should be fitted for the drysuit while wearing your intended undergarments. A drysuit must accommodate the full bulk of your undergarment system without restricting movement. If you purchase the suit before selecting your undergarments, you may find that the heaviest undergarment you need for cold Canadian diving makes the suit too tight to move comfortably. Bring your undergarments — or the equivalent thickness if you have not yet purchased them — to any drysuit fitting. If you are ordering remotely, let us know which undergarment weight you plan to use and we will factor that into the sizing recommendation.