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Keeping Warm

PARENT PAGE

You probably already know that the best things to insulate are your head, neck, and trunk (torso and abdomen).  Your head and neck both present a large vascular network through which your body loses much of its heat whereas your trunk contains most of your vital organs and your body's greatest mass.

Due to its mass, your trunk is also where your body's core temperature resides because of something called "thermal inertia" -- a resistance to change in temperature.  If these three regions are properly kept warm by controlling heat loss and maintaining your trunk's proper temperature, your extremities will be easy to care for.

Using the clothing system outlined below, I have worked all day in temperatures ranging from a wet 32°F with both rain and snow, all the way down to 19°F with an associated wind chill of -8°F.

 

Wicking Layer Insulation Layer Protective Layer Wind & Rain Barrier

© 2003 Reuben Johnson

© 2003 Reuben Johnson

© 2003 Reuben Johnson

© 2003 Reuben Johnson

Synthetic

This layer keeps you dry by pulling sweat away from your skin (IMPORTANT).  It also keeps you a little warm.

It should be skin-tight but not uncomfortable.

Don't use cotton long johns.  They'll keep you wet and cold because they retain water.

Women's nylons will work very well in a pinch.

Fleece

This layer keeps you warm.

If you need extra warmth, wear two layers of fleece over the wicking layer, but don't forget to factor in how much you'll be working and carrying.

If the day turns warm (as is often the case) you'll have to carry a lot of extra clothing in your back pack.

If the day is going to start cold but turn hot, wear these over your pants so you can doff them easily.

Nylon

This layer protects the wicking layer and/or fleece layer from jagged rocks and brush.

Nylon is very tough and will provide the needed economy in this clothing system by helping the more delicate components last much longer.

This is the same layer that will keep you cool when worn by itself on hot days.

Gore-tex® or the like

This layer shields you from rain AND wind.

Though the three previous layers WILL keep you warm if you become wet, it's always better to be dry on cold days.  Further, those inner layers can't stop the wind.

These clothing items are all light weight, compact, quick drying, and most importantly, warm and versatile.  True enough, you don't have to wear them, but the derived personal comfort and quality of work are sufficient reason alone.  If that's not enough, once you have suffered your first encounter with frostbite and/or hypothermia, you may be open to the above.

 

NOT RECOMMENDED
Carharts (pictured at right) are currently popular among construction workers, mechanics and many outdoor workers as well as research scientists.  However, they have some major drawbacks:
  • VERY bulky!

  • Natural textiles -- when they get wet, they'll stay wet.

  • Heavy -- even more so when wet.

  • Have only ONE use -- as winter clothing.

  • Difficult to shed or add layers as the day's weather changes.

  • Do NOT keep you as warm as the clothing system outlined above.

  • Insufficient as a wind and rain barrier.

  • Difficult to clean.

A cold geologist wearing Carharts while working on a frozen lake.

© 2003 Reuben Johnson

A cold geologist wearing "old school" Carharts while working on a frozen lake.  Half-way through the day, he was "freezing".  However, those wearing synthetics were warm and comfortable ALL day.  The temperature was 19°F; the wind chill was -8°F.

 

PARENT PAGE Keeping Warm Keeping Cool Nylon vs Cotton Eye Protection Knee Pads Orange Vests

 

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This site was last updated August 20, 2004

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