Shop Nilight Window Visors for Chevy Silverado/GMC Sierra 1500/2500/3500/2500HD Extended Cab 1999-2006, Out-Channel Window Wind Deflectors Rain Guards -4PCS in high quality, support 2-year warranty. Nilight window deflectors are great for all weather conditions,help improve ventilation inside and outside your car to reduce mirror and window fogging while increasing air circulation.