By prefilling the steel channels with polystyrene insulation the need for in-field insulation is eliminated. This saves time in installation and reduces the need for coordination between multiple trades. Compared to uninsulated steel framing components, the Enviro-Envelope System TM  provides dry insulation and vastly better thermal resistance. A patented, first-generation product, the Enviro-Envelope System TM  has been successfully used in large scale steel frame office and retail structures. Ideal for LEED Projects. All components IBC and UL approved and made in the U.S.A.