Heat illness is a major occupational hazard for construction workers, who often spend the summer months working outdoors or in hot, enclosed spaces. Manufacturers are producing a growing array of protective garments and products geared to the construction workforce to mitigate heat stress. In this study, researchers tested a new aluminum-fiber (“Aluminet”) vest designed to reflect heat. A population of 15 concrete and landscaping workers wore the Aluminet vest one day, and conventional garments another, while working in similarly hot and humid conditions.The research team measured the workers’ body temperatures and heart rates and solicited worker feedback on the product.