pr99 provides protection from water which is the medium, that carries dangerous organisms and substances into the lower skin cells. It's effective for approx. 3 hours after application (less if heavy abrasive demands are made on the skin). pr99 is also recommended to be worn under gloves to provide valuable secondary protection against acid burns should the gloves develop pin holes or fail altogether. pr99 goes unto the skin smooth and pleasantly. It's found to be very effective for the treatment of very dry skin.