My crew and I wear foam ear plugs (harbor freight the cheapest Ive found - big box of 200 pair for about $20). But in winter I wear EX-29 extreme isolation heaphones hooked up to my ipod. From what Ive heard these were design for studio drummers, but they work for me in any case. Ive tried wearing these in the summer but just too dang hot, starts to cook my ears because there is no air flow and they cover the entire ear. These are passive sound blocking but like the name implies blocks out 39 dbls. I dont have to turn up my ipod very loud at all to hear it clearly.
And as an added bonus they work a lot like ear muffs keeping my ears from freezing during leaf cleanups. They run about $120. Been using them for about 4 winter seasons, last winter I broke part of the headphone ear piece clasp but for about $14 they will send you a replacement.
2008 F-350 Super Duty Flat Bed
14x7 landscaping trailer
12x6 P&T hydro dump trailer w/leaf box
34" Gravely ZTR
3x21" Honda HRC216
Handful of Kawasaki trimmers
Couple Redmax Backpacks
LittleWonder 16hp loader
Around 150 lawn customers
Around 50 leaf removal only customers