Looked up sodium polyacrylate on wikipedia today, wondering what it’s purpose is in athlete’s foot spray. According to the article, it’s an absorbent polymer often used in diapers, as a thickening agent, and in personal lubricant. Now, the diaper and thickening agent parts make sense (I’m thinking it acts kind of like a sort of fast-setting gelatin).
However, the lube part makes no sense at all. I think the last thing you’d want to add is something that absorbs and locks away moisture (a natural lubricant).