Helmet Ioniser - WTF??

I'm sure I've seen an ad or write up in a magazine for an electrical pad thinggy that you stand your lid on and it ionizes the living daylights out of it. It's hot here and sweaty and I can't keep pulling all the lining out for washing the stink out, so was going to see about this ionizer but I'm buggered if I can find any details or reviews. Please let me know what you know. Thanks guys.