STYROFOAM™ Brand UTILIYFIT™ XPS 15 PSI™ Extruded Polystyrene Foam Insulation is a versatile, utility-grade product manufactured for applications that require a high R-value and outstanding moisture resistance without the need for high compressive strength. STYROFOAM™ Brand UTILITYFIT™ XPS 15 PSI Insulation is designed for use when a Type X, or lower-compressive strength, product is needed. If the superior properties of a Type IV 25 psi product are not required, STYROFOAM™ Brand UTILITYFIT™ XPS 15 PSI Insulation is a good choice for your application.