MSA Sordin Supreme Gel Ear Cushion Hygiene Kit
As you know, I think that MSA Sordin Supreme Earmuffs are the best hearing protection the money can buy.
There is one thing that you can upgrade even in these top earmuffs. There is MSA Sordin Supreme Gel Ear Cushion Hygiene Kit which comes with gel spacers. Standard foam spacers are good but gel ear seals provide tighter seal between earmuffs and ear. This is especially important when wearing shooting glasses (I think that eye pro is must for any shooter).
Gel ear seals add weight and are little thicker but they make earmuffs even more comfortable.
The MSA Sordin Supreme Gel Ear Cushion Hygiene Kit is little expensive as earmuffs themselves but recommended.