What is fog and why does it happen?Fog is simply condensation. Shower water is much warmer than the air temperature of most homes. Your warm shower heats the air and it becomes saturated. This warm moist air becomes fog or condensation which collects on all cooler surfaces - like mirrors.In the few seconds you hold your mirror under the shower spray the temperature of the moist air and the mirror equalize to create a long lasting, truly fog free image for the duration of your shower. No more temperature difference - no more fog.Many (including the visually challenged among us) choose to hold the mirror while shaving. The XoYo Mirror fits well in your hand and provides a complete reflection of the entire face while shaving.This mirror measures 10" tall, 7.48" wide and is very sturdy. Hanging hook included!The Best Fogless Shower Mirror for Fog-Free Shaving in the Shower.Advantage:1) shatterproof shower mirror.2) It's guaranteed fogless each and every time as long as you add warm water.3) Comes with 1 hook.4) With a shaving rack, you can put small items such as toothbrushes, bath towels, and shaving on the shaving rack.5) It's reasonably priced.6) can remove the mirror for hand held shaving or travel anytime.image for the duration of your shower. No more temperature difference - no more fog.What should I use to clean my mirror?Wet the mirror and clean with a tiny drop of toothpaste to keep spots away. Keep your shower mirror looking like new for years of use.How to use Hook？1.Clean the surface from oil/dust/water.Do keep dry before put the hook on.2.Remove layers of protection films before first use.3.use force.Make sure the basic of the hook contact with the wall totally.Fogless shower mirrorinformation:Dimension: 10" x 7.48"Thickness: 0.12"material: premium quality plastic (PE)