Workwear Thermal base layer top, comfortable breathable material with temperature control, made with flat seams and without labels for added comfort. Workwear Thermal base layer top, comfortable breathable material with temperature control, made with flat seams and without labels for added comfort. Thermal base layer top for Road maintenance workers, Farmers, Truckers, Carpenters, Electricians, Refrigerator Technicians, Plumbers, Painters, Cleaning companies, Installers, Warehousemen, Mechanics, Builders, Fishermen, Airport staff.