2 Pieces of Front Window Deflectors. The compatibility of window visor is varied and important. Protect people in car from insects, UV ray, wind and other debris with the window cracked, to keep car’s cab comfortable in all weather; Help to reduce temperature in parked vehicles by keeping car windows partly open; Help to keep water out while driving in the rain, let fresh air flow in to prevent windshield fogging; Help to reduce sun exposure and glare while driving.