I picked up a set with the string at the hardware store, 25db or better.
I use them mostly for when I'm vacuuming, 30min to an hour of vacuuming and it tends to get loud! and for cleaning stairs-that stair tool really screams!!
I had the big ear protectors at first but one, they are bulky,
two, they break,
three, my ears started sweating too much in summer-dries the skin,
four, someone thought I was listening to radio or something, not as professional. Gives the image of the young kid doing janitorial with the head set blaring music.