Pearl iZUMi Men's Thermal Lite Arm Warmer 79% Nylon, 18% Olefin, 3% Spandex Made in US Spring/Summer 2013 The seamless Thermal Lite Arm Warmers are lightweight and packable and perfect for cool days The perfect balance of anatomic fit, performance engineered materials and the personal interface between athlete and gear A clothing system that works to help you maintain the perfect temperature for the weather conditions and activity range day in and day out