This is a great silicone mat for protecting countertops from the heat of large pots and pans, which is why I chose it. It's not too thick or thin and is about the circumference of a microwave plate. I like the honeycomb pattern to help distribute heat. The mat can be used in a microwave, although I don't feel the need to do so. The mat is so large that I don't see how it can be used to comfortably and safely open jars and the like. This particular mat is gray, not blue as shown. It's easy to hand wash this mat, and while it might be okay to put it in a dish washer, the mat will probably last longer if hand washed. A good value.