Abstract: A fire-fighter turnout coat having an outer flame retardant shell with exterior and interior sides, the shell layer having a dual layer of first and second materials woven together in a manner which allows the formation of void spaces between the first and second materials when the turnout coat is exposed to increasing heat, the first material generally having a polyparaphenylene isophthalamide meta-aramid polymer and the second material generally having a para-aramid polymer; a second inner thermal insulating layer having an interior side and comprising a woven or nonwoven material; a moisture barrier layer positioned between the outer shell and the inner insulating layer; and a thermal detector system having a first heat sensor positioned on the shell exterior side, the first sensor having a thermistor and a thermocouple, a second heat sensor positioned on the thermal layer interior side and having a thermistor, a first display positioned adjacent the first sensor on the shell layer exterior side, a second