Polypropylene will keep you warm and dry because it has the lowest thermal conductivity of any traditional apparel fabric. Thermal conductivity is the measurement used to determine the rate at which heat (from your body) is transferred through the fabric to the outside where it is lost. A lower thermal transfer rate is a better because it means heat will be lost over a longer period of time. Polypropylene has the lowest body heat or thermal conductivity of any traditional apparel fabric including silk, polyester and wool. The U.S. Military chooses polypropylene as their cold weather base layer of clothing and for good reason. Military Thermals not only keeps you warmer and dryer, but Military Thermals even at expedition maximum weight is thin, light and does not have the bulk of other materials such as wool that would be required to provide the same warmth. This combination of thermal efficient fabric and weight, gives you more freedom of movement while maximizing warmth. Polypropylene is ideal for under work clothing and for outdoor sporting activities like hiking, biking, fishing and camping just got more enjoyable when you are warm.
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