They rise up and protect the forearm which is a real plus because sometimes fetches far the dish in the oven greater risk of burns.
Silicone is designed with patterns that allow a good grip and the dish does not skid. Good point, it is already happened to have the dough flowing on potholder (a poorly made liquid dish) and there, once put into the oven, I rinse the mitt with water.
So main question: does it protect against heat? Well yes. The manufacturer promises a resistance up to 232 ° C. Felt heat, warm (it's normal, it's almost psychological) but no burning, no discomfort. We can quietly keep an outgoing dish from the oven in her hands. No need to quickly put the dish. These gloves are of professional quality.
I also liked the fact that is also provided a potholder not a glove but lets take a dish. A silicone square that is held in the hand and conveniently replace the cloth that one takes to put a little hot dish that requires no potholder.