>Thermal stress can be a great concern for divers. Appropriate thermal protection can play a major role in making a dive enjoyable or productive. The degree of thermal protection required is highly individualized so each diver should choose equipment to meet personal needs for comfort regardless of what is worn by others. As a secondary issue, the magnitude of the hazard must be kept in perspective. Our perception of discomfort can sometimes lead to an exaggerated sense of the insult or risk. This quiz considers both foundations and common misconceptions related to thermal stress.