Standard R-Core® polyurethane-filled mainframes for improved thermal properties. Add optional sash R-Core® for maximum insulating values. Optional Hi R+Plus® and Maxuus™ glass systems enhance thermal performance and lower your utility costs. Windows featuring our Hi R+Plus® and Maxuus™ glass options earn the ENERGY STAR by meeting strict energy efficiency guidelines set by the U.S. Environmental Protection Agency and the U.S. Department of Energy. Full sash heavy-duty fin and pile weatherstripping provides low air infiltration for reduced energy bills and increased comfort.

One-piece, triple weatherstripped sloped sill with SiLok™ adds strength and eliminates unsightly week holes. Optional InterForce II™ internal fiberglass reinforced sash meeting rail adds strength and won't transfer heat like aluminum or steel. Warm-edge Intercept® insulated glass for maximum seal longevity and enhanced thermal properties.

Flush-mounted sash locks provide an extra measure of security and beautiful styling. Pinch Fusion-Welded sash and mainframes are so strong that they're guaranteed to never separate, leak air or water, or require maintenance. Ventilation limiti-locks provide added security when the window is partially open.

Low profile, ergonomic tilt-latches allow for easy cleaning from inside the home. Maintenance-free New Generation Vinyl inside and out. It never requires caulking or painting and is easy to clean. Optional Advanced Easy Clean® Glass needs cleanig half as often and with half the effort as ordinary window glass.