0 a brand name for a type of very thin polyester (= a kind of plastic), used to wrap and protect things, as insulation, and for of its shiny quality: --
Opposing walls of the gallery are coated in reflective Mylar, boosting the shimmering, icy quality of the work.
One boy was surrounded by his family, Mylar get-well balloons bobbing above their heads.
An inspection showed the fire spread by consuming the metalized Mylar covering on the insulation blankets surrounding the heater.
Mylar is a reflective material used for funhouse mirrors.