The Whiz was our first device and this was anti-bacterial and machine washable. But our customers wanted something that did not require instant washing as they were often not in a position to do this. So we developed the Whiz Plus which had a special plasma coating that repelled all liquid and did not need washing – but as a plasma coating it meant the Whiz plus could not be machine washed (women felt that when they returned home they wanted to wash or machine wash it). So we developed the Whiz Freedom replacing the plasma coating with a unique agent that is anti-bacterial, hydrophobic and machine washable (to 40 degrees).