Abstract: Thermoregulatory apparel includes garments, for close-fitting skin-contacting wear having, in preferred embodiments, a base fabric of Coolmax.sup.cm high moisture evaporation fabric having one or more insulating panels of Thermax.sup.cm or Thermastat.sup.cm hollow core fiber fabric having moisture wicking capability and applied to the inner side of the garment for skin contact at selected areas of the body where muscle protection is desired. The insulating panels maintain body heat in the protected muscles while evaporative cooling is encouraged by wicking of perspiration away from the body for evaporation from the outer Coolmax.sup.cm fabric. Alternative fabric choices and various garment combinations may be utilized.