Multi-wall polycarbonate triple wall sheet thicknesses are 12mm, 14 mm and 16 mm and provide even greater thermal insulation properties than twin wall product. All triple wall products provide high light transmission, good thermal insulation, high temperature resistance, high impact strength ( hail resistance) and can have our min-dew coating which eliminates condensation and water droplets. While increasing thermal insulation properties, triple wall still lets the light in with a minimal drop of light transmission versus the twin wall product. It is the most economical grade of multi-wall sheet available; it comes with a 10 year warranty against yellowing and damage from hail.