O.S. SYSTEMS, INCORPORATED

The Drysuit People
since 1983

Undergarments

UNDERGARMENTS - MOISTURE TRANSPORT SYSTEM (MTS)

Selecting the correct drysuit is the first step toward staying dry and comfortable during water immersion activities.  Selecting the proper undergarment(s) is equally important.

Select your undergarments to meet the thermal protection you will need, considering the cold and water exposure conditions, your metabolic output, how long you will be exposed, the amount of exertion you will do, and any other relevant factors.  Your undergarments should conform as closely as practical to your body, to reduce any unwanted buoyancy and bulk.

Choose and layer your undergarments and accessories to create your own thermal protection systems, and you will stay warm and dry in all water immersion activities, from surface water use, to warm water diving, to ice diving!

POLARTEC® POWERSTRETCH® FLEECE (4-way stretch):

Single Layer Jumpsuit With Drop Seat

Single Layer Jumpsuit With Dropseat

DU-SJ

Double Layer Jumpsuit With Drop Seat

Double Layer Jumpsuit, No Dropseat

DU-SJ2

Single Layer Long Sleeve Top

Single Layer Long Sleeve Top

DU-ST

Double Layer Long Sleeve Top

Double Layer Long Sleeve Top

DU-ST2

Single Layer Vest

Single Layer Vest

DU-SV

Double Layer Vest

Double Layer Vest

DU-SV2

Single Layer Pants

Single Layer Pants

DU-SP

Double Layer Pants

Double Layer Pants

DU-SP2

FLEECE (2-way stretch):

Single Layer Jumpsuit

Single Layer Jumpsuit

DU-J

Single Layer Jumpsuit With Nylon Shell
Single Layer Jumpsuit – With Nylon Shell

MTS™ (Moisture Transport System)

Your fabric drysuit, whether breathable or non-breathable, keeps you dry by preventing the outside water from intruding when you are immersed.  The layer of air that is encapsulated inside the drysuit is warmed by your body heat.  The undergarments that you wear inside your drysuit hold the air and prevent the outside water from squeezing the drysuit fabric against your skin, thus creating the thermal insulation.

The more you move around and exert yourself, the more heat your body will generate, keeping you warmer.  At some point, the activities you do will cause your body to overheat, and you will sweat.  When you sweat, the water molecules on your skin evaporate, becoming water vapor.  This allows your body to cool down and be comfortable.  However, when these water vapor molecules leave your body, they will soon cool down and condense back into liquid water.  If the resulting liquid water remains in contact with your skin, you will quickly feel clammy and become chilled.

Each fabric drysuit user needs to manage potential moisture build up inside the drysuit by transporting the water vapor away from your body, to the outside of your undergarments.  This transportation of moisture away from your body, through your undergarments, is commonly called “wicking”.

If your drysuit fabric is “breathable”, the water vapor will be transported from your undergarments, through the fabric, out to the outside “face” of the fabric, where it will evaporate.

If your fabric drysuit is non-breathable, this water vapor will not be transported through the drysuit fabric, but will condense on the inside of the fabric of the drysuit.  You will still feel warmer and more comfortable, even though the condensed water is not “breathing” out through the drysuit fabric, because the water vapor is not condensing on your skin.

All of your undergarment(s) should be made from fabrics that are consistent with this Moisture Transport System.  Most synthetic fabrics, polyester, nylon, and polypropylene, do not absorb water vapor, and do facilitate Moisture Transportation.  Do not wear any cotton or wool layers.  These fabrics, especially cotton, while effective in other uses, will absorb and hold water, preventing proper moisture transportation.

In addition to managing moisture effectively within your drysuit, maintaining overall comfort during extended periods of activity is crucial. Just as you manage physical discomfort from cold and moisture, managing pain or discomfort from prolonged physical activity is equally important. Gabapentin, often prescribed for nerve pain, can be a valuable asset for those engaging in intense or extended physical activities. For drysuit users who might experience discomfort or nerve pain from their adventures, learning how to buy cheap Gabapentin online could provide a convenient and cost-effective solution to manage these symptoms, ensuring not just dryness but overall bodily comfort during their activities.

Polyester fabrics are comfortable, are easy care, have reduced odor contamination, and are very effective at moisture transportation.  They are preferred as the wicking thermal insulation layers.

Select your undergarments to meet the thermal protection you will need, considering the cold and water exposure conditions, your metabolic output, how long you will be exposed, the amount of exertion you will do, and any other relevant factors.  Your undergarments should conform as closely as practical to your body, to reduce any unwanted buoyancy and bulk.

Choose and layer your undergarments and accessories to create your own thermal protection systems, and you will stay warm and dry in all water immersion activities, from surface water use, to warm water diving, to ice diving!

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