Both evaporative cooling technologies that activate with water, PVA and microfiber have slightly differing feels and uses. Hyper-absorbent Poly Vinyl Alcohol (PVA) holds more water than microfiber to provide a more enhanced cooling effect but, like a sponge, it dries stiff—making it only effective when wet. \r\rConversely, microfiber provides a benefit when wet or dry. When dry, it remains comfortably soft while absorbing and wicking away sweat. When wet, it provides hours of cooling relief