Frame 1. Strong, fusion welded construction for structural integrity. 2. Maintenance free white PVC never needs painting. 3. Multi-Chambered frame for enhanced strength and maximum insulation for energy wise homes. Glass 4. Warm Edge technology assists in the elimination of perimeter condensation on the insulated glass unit. 5. 7/8” overall insulated glass for superior performance. 6. High performance options such as Low-E, Argon Gas are available.