Steve Sr? said:It is that time of year when the mercury is steadily falling. Even
in North Carolina it has been getting cold enough lately to bring
out the long sleeves and tights.
Quoted message said:I have a lot of the cold issues sorted out as far as what equipment
to wear at what temperature. However, I still have one nagging
problem.
Quoted message said:That problem is with my chest and inside of my arms getting cold in
the front while my back sweats. I have tried different layering
schemes but none seem to work very well. The layers consist of a
long sleeve jersey, short sleeve jersey, and a thin fleece jacket if
temperatures are cold enough.
Quoted message said:All of these seem to have the same problem. They appear to breathe
too well in the front and not well enough in the back.
Quoted message said:One question that comes to mind is how tight should these layers be?
I don't seem to have problem with my legs being cold or sweating.
Is that because of the material that the tights are made of or is it
because they are contacting every square inch of skin continuously?
Quoted message said:My torso layers are not real loose but are not nearly as tight as my
tights? Could this be the problem with my torso getting cold in the
front while sweating in the back?
If you consider the effects you are trying to control, rather that
brand names and types of garments you might have a better chance of
success.
Insulation is made of trapped gas (air) and if it is in contact with
your body and has no exchange it will become wet (steamy). This is
why fluffy insulators that allow air to pass gradually (like
knit-wear) are used, so there is an exchange and drying effect.
One of the poorest pieces of clothing for keeping warm, especially at
speed (descending) is a loose wind-proof jacket. It will begin to
flap noisily and while doing that, generate forced convection,
essentially a bucket brigade of air being pumped from the cold outside
to the body as the waterproof or nearly so cloth pumps. There's a
hell of a wind inside a flapping jacket.
You can't have warm extremities if the "hot water pipes" going there
are frozen. Your arms and legs must be kept warm to insure warm
fingers and toes. Just mittens or booties do no good if the supply
channels are frozen.
Thick layers of knit wear breathe and allow moisture to escape while
water and wind proof shells kill that effect. That's what's wrong
with most jerseys today and why they are ridden with their zipper all
the way open from neck to waist on climbs because they don't breathe.
You'll note there are no zippers on woolen or synthetic knit jerseys
except to get the head in and out. There was no need to have them
flap in the breeze to keep cool. The converse is true when cold.
Current jerseys don't breath benignly causing cold sweat.
It's not how tight they fit but how much they breathe.
Jobst Brandt