PWX Flex High denier delivers high power. Most flexibility and breathability. UV Protection High Sun protection factor means long sessions in the sun wont cost you your skin's health. Moisture Management The lower denier (high filament) yarn on the outside draws moisture through from the high denier (low filament) yarn on the inside. In addition, the inside yarn transports water through a capillary action. This combination multiplies the moisture management performance, keeping you comfortable. Read more… Antibacterial Eliminates bacteria and body odour with a high performance nano silver application.