OBJECTIVE:This study investigated whether using thermometers clipped on workers' shoes would result in different heat exposure estimation and work-rest schedules compared to using area-level meteorological data alone. METHODS:Alabama workers (n = 51) were individually monitored using thermometers on shoes. Wet Bulb Globe Temperature(WBGT) was estimated using thermometer temperatures(WBGT(personal)) or nearby weather station temperatures(WBGT(WS)). Work-rest schedules were determined from WBGT, clothing, and hourly metabolic rates estimated from selfreported tasks and bodyweight. RESULTS:The percent of hours exceeding the threshold limit value (TLV®) were estimated at 47.8% using WBGT(personal) versus 42.1% using WBGT(WS). For work-rest recommendations, more hours fell into the most protective schedule (0-15min work/45-60min rest) using WBGT(personal) versus WBGT(WS) (17.4% vs. 14.4%).