If it is cold, it will cool the body down. If it is hot, it will heat the body up. Synthetic fibers, because they do not breathe, actually promote perspiration causing the body temperature to react more severely. SmartWool absorbs this moisture into thousands of micro-porous cells where it is broken down into vapor and evaporated. Synthetics can only transfer moisture and have no ability to evaporate it.
Nothing insulates better than dry air.
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