A Backing Type: Plain , Color: Split Charcoal and Blue , Density: Charcoal 2.2 lbs./cu. ft., Blue 1.8 lbs./cu. ft. , Finish: Coarse Cell , Firmness @ 25% Deflection: 9 PSI , Length Tolerance: +/-0.250" , Material: 2 lb. Polyethylene/1.8 lb Dark Blue Polyethylene , Stretch Limit: 0.5 , Temp. Range: -20 to 150 F , Tensile Strength: 32 PSI , Thickness Tolerance: +/-0.250" , Type: Closed Cell , Width Tolerance: +/-0.250"