There's a product called the "Ove Glove" which is an oven glove (not mitt) that seems far more resistant to heat than the usual padded oven mitt. The down side is that it is in the form of a knitted glove, and thus offers scant protection against hot liquids. I have a pair, and use them when I need to do something a bit more dangerous, like get a pizza out of the oven, where you must manually fiddle around in there. (A basic mitt is a lot easier to slip on and off, though.)