DuPont™ Styrofoam™ Brand Highload Extruded Polystyrene (XPS) Foam Insulation is a closed-cell foam insulation designed for use in low-temperature (freezer floor) applications, highways, airport runways, bridge abutments, parking decks, utility lines, ice rinks roofs and plaza decks. Styrofoam™ Brand Highload Insulation features exceptional moisture resistance and R-value retention. Styrofoam™ Brand Highload products resist compressive creep and fatigue, delivering long-term compressive strength.