Winter Gear  A New Hat Now Means Faster Racing Later, or Why You
Should Run Long This Winter  January 1, 2006  How do you run for
more than two hours when it is 10 degrees or colder? Most people
know to layer their clothing and run into the wind first. But on
a really cold day you should know another rule: Bring more hats.
With a supply of fresh hats tucked in my jacket I have run 23
miles in five degrees, with windchill below zero. A layer of
icicles had built up inside my jacket by the time I finished,
but rotating hats kept me perfectly comfortable.     Dressing
for the cold is a fine balanceyou dont want to be too cold, but
if you overdress and sweat too much you will be even colder by
the end of the run. You should be warm enough to sweat a little;
if you are so cool that you are not sweating you may be
underdressed for the weather.  The most important body parts to
protect are your head and your hands. Of these, the most
important is your head. Scientists estimate that 50 and 80
percent of body heat is