post #61 of 113
9/11/07 at 8:07pm
Finn doesn't. Hydrophobic fabrics do the opposite of wicking, which is good in extreme conditions.
Johnny, keep checking at Sierratrading post or Campmor. This borders on TMI so lets just say no cotton on my butt.....
what price for "dry parts" ?
But telerod doesn't.
It snows 650 inches each year here. If you're not out when it's precipitating, too bad for you.
And frankly, if you don't know what a workout is on alpine gear, don't come skiing with me. You won't keep up.
Since you seems to be suffering from a lack of technical-geekism here's some clarification for you.
Hydrophobic fabrics are wicking fabrics. Hydrophobic fabrics work because a fabric like cotton is extremely rough and has a lot of surface area where moisture molecules get stuck and saturate the fabric. Hydrophobic fabrics like polys are very smooth and have very little surface area where the water molecules can get stuck on. The the moisture moves quickly through the fabrics quickly allowing the water to move away from the fabric and skin, remaining dry. This is how diapers work, the inner lining is hydrophobic and move the moisture away from the skin and into a paper absorbancy layer. Here's the proof.
Now then fabrics like GORE-TEX or E-vent work by allowing moisture to wick and pass through the inner layer through microscopic holes but the outer layer blocks moisture from moving through to the inner side. The general concept is that the holes are too small for most water drops (rain, snow) to pass through but large enough for moisture to wick away and evaporate.
http://www.newton.dep.anl.gov/askasc...9/gen99960.htm- tech speak
http://www.eventfabrics.com/we_sweat.php event explanation
There you go! Hope it helps....
I know that, but wick means to draw up fluid which is what cotton does and poly doesn't. Try burning a candle with a wick that doesn't absorb wax. In cold rain or snow storm, I use poly because it doesn't absorb much water. We're on the same page, I just prefer the English definition of wick rather than the marketing definition. I'm not saying tech base layers don't work, just that I think wicking is a poor word to explain how they works.
There are a few points I'm not clear on. How does the moisture move through the synthetic base layer? Osmosis? Evaporation? Does it have to be vapor or can liquid water pass through? Because the fabric does not absorb much water it seems like it will leave the sweat on your skin unless some other mechanism causes the water to pass through. My guess is body heat vaporizes the sweat and vapor pressure moves it out. That's why it doesn't work so well in rain. If you are over-dressed the tech base layer can reach it's saturation quickly if you are in driving rain, even under a very good waterproof shell. The problem with cotton is it can take up a lot of water before saturation and water is an excellent conductor of heat. The cotton will not dry even under a good rain jacket because it is so absorbent and your body heat will be drawn away from your body. That's when the cotton kills. In cold, wet conditions, you need your clothes to insulate not conduct.
I think skiing in cotton on warm spring days is relatively safe where I ski, but in the mountains weather can change quickly. You can get injured, the patrol doesn't find you, you spend the night out there. So yeah it's probably a bad idea. I'm not going to stop doing it, but I dress for the weather. I wear good stuff when I need to. I wear cheap stuff when I can.
|Wicking really just means to draw through. In this case the fabric is permeable and allows the moisture molecules to be absorbed and yes, they pass on the moisture to either the air, ot be evaporated or to the next layer if its is absorbant. Why it doesn't hold the moisture is because the surface is smooth and the moisture has no place to stick or be held like cotton which is fibrous and has a very rough surface.|
|Water may conduct heat well but it doesn't retain it and will cool very quickly, leaving you cold. It has no thermal properties (that act as an insulator).|
|The body cools itself through sweating...|
|when the body remains wet and the body temperature falls (through falling temps, ending of excercise, wind exposure), the moisture left behind causes a huge temperature shift, resulting in a nasty thing called hypothermia.|