UtilityFit^™ 15 PSI extruded polystyrene (XPS) foam insulation is a Styrofoam^™ Brand solution manufactured as a versatile, utility-grade product for applications that require a high R-value and outstanding moisture resistance without the need for high compressive strength. UtilityFit^™ 15 PSI XPS insulation is designed for use in the United States 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, UtilityFit^™ is a good choice for your application.