THERMO-WELD in the tradition of Excellence State of the art technology has created a Vinyl Welding process. FUSION-WELDED FRAMES assure you top Quality. * High Strength - Low Weight * Strong and Rigid * Truly Square Thermo-Weld assures you of a lifetime of problem-free operation and enjoyment. Thermo-Weld stops air and moisture penetration com pared to other style frames. Unique... INSULATED MAIN FRAME gives you maximum insula tion and potential savings. THERMO-WELD CudOM "10" combines the insulating value of "all-vinyl" frames with polystyrene insulation. Compare the difference... The higher the R-value, the greater the insulating value. THERMO-WELD CuAtOM "10" assures you of the newest technology to lower your fuel usage. YOU SAVE MORE!! R-value information for Custom-10 from Industry Sources. Optimum Quality... INSULATING GLASS THERMO-WELD incorpor ates the latest in glass making technology. Get the Best of Modern Technology. ? All American-made glass ? Float glass - 98% flaw-free ? Hot-melt Butyl seal... the latest and the best. FULL TEN YEAR WARRANTY Insulating glass is not all the same. ? Only the latest technology assures you the protection you need. ? Look for SIGMA seal. This shows testing for durability and quality.