I like my Peltor H10 muffs, which have an NRR of 30db.
In ther warm weather they make you heat up quicker, though. I use them chainsawing & shooting year-round, and doing any other VERY loud things.
In summer, for less painful noises, like the tractor, I'll go with the baffle plugs that are connected together with the little plastic cord, I find when i remove them I can drape them aroud the neck for a short bit, then have them "around" when it's time to resume.
I do keep some of the little foamie plugs around, here and there, good back-up, because we often use what we have readily available.
Gas powered riding mowers, especially older ones, will just about make you go deaf.