Under Slab Insulation - 4' X 75' (300 sq ft) Patented Bubble/Foil/Bubble Design - 300 square foot roll (4' X 75') 57% Reflectivity, 43% Emissivity, 100% vapor and radon barrier Creates a thermal break between ground and slab, Moderates slab temperatures Strong 140 PSI compression rate, High 85 PSI puncture rate Designed specifically for use under concrete with radiant heating systems