They sit at the bottom of your convection, toaster, gas, or microwave oven and catch all those crumbs or drips from your favorite foods. These mats are non-stick, so they won’t stick to your oven and food won’t stick to them. When you notice that your oven liner needs to be cleaned, just take it out of the oven and clean it! These mats are completely washable, making oven cleaning an easy chore around the house.