Using the most advanced performance technology available, EIS's proprietary fabric offers you the highest level of skin protection. EIS COOL SHIRT® is proudly made in the USA. Fabric technology provides you with many outstanding performance features. Offering superior sun protection with the equivalent of UPF 50.  IceFil®️ is a cooling factor that is embedded in the fabric reduces body temperature by 5 degrees will provide maximum comfort in humid, hot weather. Movement generates air flow creating a cooling effect. Microscopic nano particles attached to fabric fibers make these performance features long lasting. Not a fabric finish. Our special wicking fabric helps control body odor.