Seirus Innovation Men's Dynamax Workman Cap 85% Polyester, 15% Spandex Imported DYNAMAX, THE FEEL IS UNREAL - More stretch. More warmth. More wicking. More wind block. Still Thin LIGHTWEIGHT - Warm wicking breathable fabric absorbs sweat and ventilates, keeping you dry and comfortable SAFETY FIRST - Reflective stripes for high visibility on the job or in the field VERSATILE, STRETCHY - Fits under any hat, cap, helmet or headwear, 6 dart construction ensures a snug form fit ESSENTIAL EQUIPMENT - A must have Accessory for any cold weather outdoor activity, easily fits in your pocket 4-way Stretch Comfort Micro Brushed Inner Wind Resistant Ultra-thin, Ultra stretchy