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<p>Gil -</p>
<p>There is always a lot of blood flow between the heart and the
brain which passes through the neck, fairly close to the skin.
Among the many things blood does, is act as a working fluid to try
to help thermoregulate the body... passing hot blood near the
surface of the skin where evaporation of sweat is cooling the
skin... The neck would be an obvious place to apply extra
external cooling efficiently. <br>
</p>
<p>As with a cool cloth on the head, I think there is a perception
issue involved, meaning that when you are overheated, cooling the
region of your body you associate with "self", likely *feels*
better than say, cooling your feet or your glutes... provides
quicker apparent relief.</p>
<p>I'm aware of the type of fabric you speak of, but have never used
or inspected any. I'm assuming it somehow manages to *both* hold
enough water to not evaporate away immediately but at the same
time, have enough surface area (microstructure) to allow for a lot
of transpiration. Why "snapping" it abruptly works to
(re)improve it's cooling potential isn't as obvious to me, I'm
betting it has been written up many times in everything from the
popular press to academic journals in material science... time to
practice more Google-Fu?</p>
<p>- Steve<br>
</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 7/19/18 3:58 PM, Gillian Densmore
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMaMUCRFJAS2z22MSyaB2fJr3G=c4NUqVXuXiJ=vNtAA+0WZ2A@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<div dir="ltr">Preface: I am not a fan of email...in it's current
form. I have some pretty good notions to why. I will respect
the mods and leave it their.
<div><br>
</div>
<div>However, Mr. Homes yes! that is part of wonderful sense of
curiusity why they are so helpful and why you can get some to
refresh some... A shirt made sense I thought (it's got a lot
of it to it)</div>
<div>But basically bit of swim suit material around my neck
helping? oO So...just out of curiosity I thought: let me ask!</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jul 18, 2018 at 8:40 AM,
Robert Holmes <span dir="ltr"><<a
href="mailto:robert@robertholmes.org" target="_blank"
moz-do-not-send="true">robert@robertholmes.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">If you really want to blow your mind,
consider these mesh cooling towels: <a
href="https://www.amazon.com/gp/product/B06Y4RW17N/ref=oh_aui_search_detailpage?ie=UTF8&psc=1"
target="_blank" moz-do-not-send="true">https://www.amazon.com<wbr>/gp/product/B06Y4RW17N/ref=oh_<wbr>aui_search_detailpage?ie=UTF8&<wbr>psc=1</a>
<div><br>
</div>
<div>When you've been wearing it for a while and it has
warmed up, you take it off, give it a sharp "snap",
and it's immediately cold again.</div>
<div><br>
</div>
<div>I use one when the temperature is getting high in
my (non-air-conditioned) house and it works a treat.</div>
<div><br>
</div>
<div>—R</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Tue, Jul 17, 2018 at 9:30 PM Gillian
Densmore <<a href="mailto:gil.densmore@gmail.com"
target="_blank" moz-do-not-send="true">gil.densmore@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div>AHA! googlefu skills worked better this time.
Something to do with with the neck (for example)
helps with body heat and the wraps let off cold
water...</div>
<div>I guess I just don't understand how something
that small can help cool you down. So I just
thought I'd ask what the science might be</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jul 17, 2018 at
9:00 PM, Gary Schiltz <span dir="ltr"><<a
href="mailto:gary@naturesvisualarts.com"
target="_blank" moz-do-not-send="true">gary@naturesvisualarts.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div dir="ltr">Are you getting overheated during
class? I would assume that your teacher is
suggesting this as a way to help keep cool.
Evaporative cooling is especially effective in
dry climates like Santa Fe. See <a
href="https://en.wikipedia.org/wiki/Evaporative_cooler"
target="_blank" moz-do-not-send="true">https://en.wikipedia.org/w<wbr>iki/Evaporative_cooler</a>.</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jul 17, 2018
at 9:29 PM, Gillian Densmore <span
dir="ltr"><<a
href="mailto:gil.densmore@gmail.com"
target="_blank" moz-do-not-send="true">gil.densmore@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<div dir="ltr">I has a science question. I
trying out doing more excersize. In one
of my zumba classes a teacher sugested I
try a wet towel on my head (before
class) and then a wet scare around my
neck during class.
<div><br>
</div>
<div>I feel as my googlefu skills are
failing because I can't find a reason
why that helps. Anyone know what the
science is? </div>
<div>LifeHacker and a pretty dated
StackScience blurb speculated it has
to do with having just enough gold
water (relative to the hot air neer
your body) to somehow make kind of
cool air zone.</div>
<div>Somehow how I am...skeptical </div>
<div>Cooling of your head makes sense
(hair gets wet and you cold water on
your head just feels really good in
the summer)</div>
<div><br>
</div>
<div>But I don't get why cold towel or
scarf around your neck can help.</div>
</div>
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FRIAM Applied Complexity Group listserv
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