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. Insulates better - SmartWool, because of the natural crimp of each fiber creates millions of microscopic air pockets that give it loft, creating an insulation layer that can block out cold or heat, leaving a dry layer of air next to the skin.
Nothing insulates better than dry air.
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