This document provides training on heat stress awareness and prevention. It defines heat stress as resulting from working at high temperatures, humidity, or lack of ventilation. Symptoms range from mild like fatigue and irritability to severe like heat cramps, exhaustion, rash, and potentially fatal heat stroke. Supervisors are responsible for monitoring workers for symptoms while workers must be informed, educated, and follow precautions like staying hydrated, acclimatizing to heat, and reporting issues immediately. A heat stress flag system and urine color chart are visual tools to communicate risk levels and ensure workers remain properly hydrated in hot conditions.