Step up your game when you turn on the heat. These heat-resistant clear covers are ideal for binding documents when using thermal binding systems or for documents that will be exposed to high temperatures. Standard clear acetate sheets can wrinkle when exposed to high temperatures or when they are bound with a thermal system such as a Fastback. These covers are made from a unique formulation that can tolerate the higher temperature without becoming disfigured. That being said, these covers are still absolutely clear, water proof and easy to punch as the other options that we carry. Plus they are available in a ton of awesome sizes.