Cool Best Polyester : 94.5% Light Reflective Fabric: 5.5% One filament of light reflective yarn knitted in the center of the line pattern. The fabric has the following features: - Soft anti-pick, anti-pill fabric has a cleaner, snag-free finish - 4-way stretch fabrication allows greater mobility in any direction - Moisture Transport System wicks sweat & dries fast (wicking) - Anti-odor technology prevents the growth of odor causing microbes - Reflect light when there is a direct lighting source. Good for active life. - Special light effect under camera flash light Pattern and color are customizable.