Iron Quick, 45" wide- a specialty fabric made of 100% aluminum with 100% cotton backing. It's designed to protect from heat (up to 399?), but does not have any insulating properties so it's long been the go-to choice for things like ironing board covers. This doesn't afford a huge amount of insulation, but you could use more than one layer or add a layer of regular or thermal batting.
When sewing, you should use a size 80/12 needle.
Iron Quick products should ever be used in the microwave.
Can be machine washed but should then be air dried – not tossed in the dryer. You can also use a damp cloth to wipe clean.