A bug deflector does what its name says... It deflects bugs and other debris from your hood and windshield, providing extra protection for your truck or SUV. Bug shields deflect airflow up slightly from the hood surface. This pushes most bugs, rocks, and debris up and away from your windshield. Along with deflecting bugs, bug shields also protect the leading edge of your hood from rock chips and other road obstructions that might fly up at you on your way down the road.