Thanks all for the great advice. Your posts got me thinking and I checked again after I got up a little while ago, but my feet don't perspire so I don't think the splint heating up my foot would cause the burning. There is a wedge that allows for an incline and more stretch, and that is made from some sort of white material that also causes my feet to burn. Although the spilnt has this foam stuff on it, it doesn't make my feet hot and it seems like contact is the culprit while other times they just burn without touching anything. This condition is very strange.