They're some of the best known sunscreens on the market but now a new report claims they may not be as effective in protecting your skin as you might think.

It's a right of passage for spending long hours in the sun, slapping on the sunscreen and nearly everyone we talked to has their favorite brand.

“For myself I use ultra sweat proof Coppertone,” said one sunbather.

“I like Banana Boat ultra defense,” said another.

But a study by the Environmental Working Group tested nearly 1,000 name-brand sunscreens including these popular brands; they found 4 out of 5 did not offer adequate protection.

The report goes on to say most break down when exposed to sunlight, have ingredients that are linked to skin damage and make bogus claims.

University Hospital Dermatologist Dr. Avis Yount says while more studies need to be done on sunscreens, consumers should never stop wearing it.

“You need one that protects against both UVB and UVA wave lengths of light,” she said.

She says using a sunscreen with a broad spectrum sunscreen with SPF of 15 or more can help protect your skin and make sure you apply 30 minutes before going in the sun and every two hours after.

“You know if somebody does not use enough sunscreen then the protective factor at a 50 may go to a seven,” she said.

The Food and Drug Administration has yet to set clear safety standards for sunscreens.

Dr. Yount says using sunscreen isn't the only surefire way to protect your skin while outdoors. Make sure you also wear loose, fitting protective clothes and hats.