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answers.yahoo.com/question/index?qid=20100308170808AAd4qb3

Polyester is extremely warm its what the U.S military currenty uses in their extreme cold weather gear (jackets) it can also be used as a base layer as it will wick moisture away from youre body to keep you dry which will help keep you warm as far as these other jokers telling you cotton is good im sorry to say cotton is a terrible fabric to keep you warm period.

www.reference.com/beauty-fashion/warmer-cotton-polyester...

Polyester is much warmer than cotton and in cold weather, cotton should not be worn close to the body, particularly in undergarments. Cotton does not hold heat well when it is dry and when it is damp or has absorbed body moisture, it will allow heat to move right through.

oureverydaylife.com/differences-between-polyester-and...

Neither nylon nor polyester are insulating, in that they don't offer warmth, nor do they offer a lot of protection against the elements such as wind and rain. Both materials are best worn as an inner layer -- either the base or mid layer. They can be used, however, as part of an insulating layer. The outermost layer/shell of an insulated puffy ...

hikertrack.com/does-polyester-keep-you-warm

Does Polyester Keep You Warm? In short, the answer is yes, polyester will keep you warm when combined with good other fabrics like wool and cotton.But, polyester can also allow breezes to pass through and keep you cool. Depending on the quality of the fabric and the purpose the clothing article or outdoor product has been designed for, you will have great multifunctional use from this fabric.

www.leaf.tv/articles/what-kinds-of-fabric-keep-you-the-warmest

What Kinds of Fabric Keep You the Warmest? ... Fine wools tend to be less itchy than coarse wools. Wools that are blended with other fabrics are not as warm as 100 percent wool, and their warmth depends on the percentage of wool in the fabric. ... with the synthetic polyester polar fleece varieties providing the best insulation. Both thick and ...

www.quora.com/Why-is-polyester-as-well-as-many-other...

In cold weather, again, a cheap polyester t-shirt, or even a wicking product, will not keep you warm because it is thin, wicks away your perspiration (which cools you further), and is just not engineered to keep you warm. But a Polartec garment (100% polyester) is designed for warmth and will keep you very warm, and will continue to insulate ...

www.amazon.com/Christies-Home-Living-Polyester-Alternative/...

Buy Christies Home Living Polyester Warmth King Down Alternative Comforter Duvet Insert 104" L x 88" W Medium White: Comforters - Amazon.com FREE DELIVERY possible on eligible purchases

www.youbeauty.com/fitness/cold-weather-clothing

The cotton actually wicks away the moisture from your skin, the polyester does not absorb water so air spaces in that keep you warm and the big squares all air trap the air and do not conduct heat ...

www.wilderness-survival.net/.../showthread.php?21580-Wool-v-Polyester

We swear by the 100% Merino wool undershirts. They are soft, warm, very thin and feel great against the skin. Stoic is a great brand but Icebreaker and Ibex are just as terrific and I own those as well. They come in short & long sleeves, zippered and not and all sorts of combinations and people just rave about them.

www.lonelyplanet.com/thorntree/forums/activities-gear/...

"polyester" comes in many forms but polyester baselayers that are made to keep you warm will work that way. Some people prefer wool, some don't. If you like what you have stick with it. Your friend probably prefers wool but has neglected to realize that "better" is subjective and varies by individual so take it with a grain of salt.