These casserole carriers are insulated with Pellon Insul-Fleece and an extra layer of cotton batting. They're perfect for hot or cold casseroles or salads and can easily accommodate a pie! They are reversible too. They measure approximately 19-1/2 x 19-1/2 inches square and are super easy to use. Simply lay your casserole on the flat carrier and pull the carrying handle strap through each of the loops. The carriers can also be used as a trivet and will lay flat under your casserole dish to protect the surface below. Don't use the carrier in the microwave as Pellon Insul-Fleece™ contains a polyester batting that is needle punched with an aluminized scrim binder that helps to reflect heat or cold back to its source. Insul-Fleece™ can be sewn through and once sewn, is machine washable a