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.