Pella Impervia series fiberglass sliding window in white — XO configuration (operable left panel, fixed right panel). Glass is annealed Low-E 180/189 with argon gas fill. NFRC rated: U-Factor 0.25, SHGC 0.48, VT 0.59. ENERGY STAR certified and WDMA certified. High-altitude rated — ideal for Colorado installations. Rough opening size approximately 47.5"W x 59.5"H. Condition is new — all labels, foam corner protectors, and hardware bag are fully intact. Includes window unit and screen.