Product review (1 stars): Doesn't do what I thought it would...and doesn't do what it's supposed to all that great
I read about this product and thought it was a great idea because I thought it would:

1. Stay cool enough in the over that you would be able to pull out the oven rack without an oven mit to check the temperature or flip what your cooking.  They do stay cooler longer than the metal rack, but they get way to hot to be able to grab and pull out the rack without an oven mit.

2. Make it so touching the rack would be no big deal...like what's shown in the picture here for the product.  Maybe I'm just a complete baby when it comes to heat, but they get plenty hot to make it uncomfortable to touch them.  The will probably prevent you from getting burned, but you still don't want to bump them after you've had something in the over at 400 for 30 minutes.

Unfortunately, in addition to not providing the two benefits I thought they would they also have a negative drawback:

1. With these on your oven racks you can not easily slide dishes/pans off the rack because the "guard" creates a lip that you have to pick the dish/pan up over to remove from the oven.  This is just annoying and actually forces you to reach into the oven more making it more likely you will come into contact with the other rack.

All in all, a great idea that doesn't perform.