Thermomirror Demister Pads are an ultra-thin demister pad that provides a clear and condensation-free mirror even after a hot bath or shower. These pads are fully self-adhesive for attaching to the back of your mirror and have a single 240V connection point for easy installation. These demister pads are covered by a 10 year warranty. The TM2828 is 280x280mm and is suitable for mirrors of 380x380mm or larger. It is designed to fit between hangers on smallers mirrors. For more details see the FAQ section. Typically a mirror fogs up due to the difference in temperature of the mirror and the temperature in the bathroom. The bathroom is warm from the shower or bath whilst the mirror is cold and this difference in temperature causes it to fog up. The mirror defogger warms the mirror to reduce the difference in temperature ensuring a steam free mirror in the bathroom.