>>>Blocks 97% of Radiant Heat >>>Long Lasting, Light weight, easy to install with a razor knife and double sided tape or spray adhesive >>>Wont Mildew or Absorb Moisture >>>Controls Thermal and Radiant Heat, Reduces Sound, & Minimizes Vibrations installed >>>Thermal & Vapor Barrier - Blocks 97% Radiant Heat >>>Made in USA >>>Thickness 1/4inch.