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Clothing design for comfort and work performance in extreme thermal environments.

Assessment of the insulation (clo) value and evaporative impedance (im/clo) value of a clothing system can provide an accurate estimate of the relative advantages of one garment or fabric over another with respect to the thermal protection and/or strain associated with wearing the clothing. There are effects of cut, drape, and fit that must receive special consideration. The techniques presented are a valuable tool in clothing design, and such evaluations are desirable in studies of the man-clothing-job-environment-system for ordinary clothing as well as for such advanced concepts as clothing systems with intrinsic environmental conditioning sources.