Insul-bright is a very clever needle punched insulated lining.
The supplier states "The needled poly fibres resist conduction while the reflective metalized film resists radiant energy reflecting hot or cold energy back to its source. Easy to sew and machine washable"
So it keeps hot things hot and cold things cold. DO NOT put it in the microwave, otherwise...boom!
It can be used for lunch bags, cool bags, oven gloves, ironing board covers, ironing mats......
93.75% Polyester Fibre
6.25% Metalized Polyester
Its is machine washable on a warm wash, can be tumble dried and ironed with a warm iron (once covered with a fabric)