Yes, they are for stone protection only and do not offer any UV protection. My concern would be if hazing reappeared later on after they'd been applied. Can the same covers be removed and reapplied later; or, once they are removed do new ones have to be re-purchased??? I don't believe the stone guards will prevent eventual hazing from the sun.
Personally, my best stone protection method is not to tailgate the vehicle in front of me (it saves both my headlights & paint job), while giving me greater braking distance/reaction time.
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