Product review (3 stars): Will prevent burns
The material does transfer a lot of heat, but at least you won't burn yourself if you accidentally touch it, whereas you would if it wasn't there. If you have a slightly raised metal bar on the edge of your oven racks, then the sleeve won't stay flat, and the side with the metal clips will hang down, so there is a slight possibility that you may touch the metal (hot) part if you go grabbing it.