Unless a particular task dictates otherwise, avoid impermeable fabrics which reduce the body's ability to dissipate heat. Loose cotton fabrics are best suited for this environment. Light-coloured clothing should be worn when working outside in the hot sun. In dry climates, adequate evaporation of sweat is seldom a problem. In extremely hot environments, air, water or ice-cooled insulated clothing should be considered.
Ordinary clothing provides some protection from heat radiated by surrounding hot surfaces.
In a high radiant heat situation, reflective clothing may help. Hot and Cold Environments Workers who alternate between very hot, dry indoor environments and cold winter outdoor environments may choose to wear long underwear which have been shown to moderate the extremes in temperatures. An emergency response plan for treatment of affected individuals should be developed. If a heat disorder is suspected, remove the individual to a cool area, administer cool water and seek medical attention immediately.