As others have said, Double up. The foam plugs have better protection than ear muffs IF installed correctly but if you end up next to a muzzle brake neither one will be enough. The passive fat ones have the best protection but they are normally the heaviest, the electronic like the walker Razor slims with the addition of the replacement gel pads are the most comfortable with glasses but the muffs are $40 and the pads are $20 so not cheap but they do allow you wear foam plugs and still hear the range officers commands and doubled up provide good protection.
Take it from a guy that closed the barn door after the horse left, modern guns are 2x-3x louder than just a few years ago. What use to be good enough isnt anymore. There was a study showing that noise behind a gun with a muzzle brake was 2-4x louder than without the brake and if someone is doing a mag dump next to you, you will be deaf before you can get off the line.