REAL POLARIZER: Our Car Sun Visor Extension uses NASA polarizing technology to filter out polarized light, eliminate any visual discomfort of driving during the day or night, block direct sun light but keep enough vision to ensure safe driving.You could also test the polarizing products with the test card in the package. | NO GAP IN CAR VISOR PROTECTION: Veharvim Car Sun Visor Extender blocks sunlight and sun glare, with no gap between the sun visor and your extender. This ensures driving safety and maximum comfort. | ADVANTAGES OF PC LENSES: Our visor is 60 times stronger than glass, 20 times stronger than TAC, and 10 times stronger than resin. PC Lenses also have better light transmission, impact- resistance, temperature resistance, and scratch- resistance, resulting in a longer service life | EASY TO INSTALL IN MULTIPLE LOCATIONS: The unique universal hook-and-loop fixing strap allows you to install it on both the driver's side and passenger side as needed. It also works for side windows. Since the fixing strap is adjustable, it is suitable for most car models, including cars, SUVs, and trucks. | CUSTOMER CARE: Polarization efficiency is ≥95%, effectively filtering out dazzling glare and blocking harmful rays such as ultraviolet light. For any issues with the product, please reach out to us immediately.