Silver Edge Gear Silver Lined Skull Cap Lined with silver for stench bashing performance. The silver can go on stopping the stink for the life of the Skull Cap. Transports moisture away from your head Conductive silver lining feels great against your skin Rapid evaporation keeps you cool Designed to wear under your helmet or baseball cap One size fits most The photo image shows the black outer and silver inner lining We have conducted a number of tests to determine the efficacy of our fabrics. The anti-bacterial properties were evaluated using an AATCC Test Method 100-2004 Assessment of Antibacterial Finishes on Textile Materials. This testing of the silver coated fabric showed that it prevented the growth of odor causing bacteria, including MRSA, and after 25 washes the odor bashing performance was unchanged, meaning it did not loose any odor bashing power. Conducted by The Manufacturing Solutions Center, listed with CPSC as an accredited third party testing laboratory