I know I always wondered how two knit (or crochted) layers were supposed to be insulated enough (even with all those stitch "holes") to use for hot baking sheets, so I decided to experiment with adding more insulation to my own prototypes.
For my knit hot mits, I knit two dishcloths, one with the crocheted loop, and then sew in two squares of denim from an old pair of jeans onto the second square. Then they are sandwiched together and crocheted shut with a crocheted loop to allow them to hang out of the way while also being a pop of color in one's space.
Doesn't that make you feel more confident when you're ready to pull out that hot pan of yummy cookies? ;)