The sash on Lincoln’s redesigned Glider Windows slide on nylon pads instead of rollers for easier, quieter operation, says the company. Other improvements include coped joints rather than miters and an optional extruded aluminum cladding that’s available in 17 stock colors and unlimited custom colors. Glazing options include an exterior coating called NEAT that supposedly resists dirt and streaks. A fully equipped 5'-4" x 5'-0" unit costs about $1,160. Lincoln Wood Products, 800/967-2461, lincolnwindows.com.