I'm looking for quality ear protection, and read some good remarks
about the ER 15 and ER 25 Musician's Earplugs form Etymotic Research

I used the Etymotic plugs (ER 15) for years and was pretty happy with
them. They are not flat!!!! They reduce 15 dbs of high end and leave
the low end more or less untouched.

Isn't the rule for building a studio that you need 9 feet of
insulation to completely eliminate the very lowest frequencies? You
can't deal with low frequencies with a half inch of insulation. But,
you don't need to. The high frequencies are what is damaging, and
what you're going to lose in your hearing eventually.

I can't imagine mixing with them (and I wouldn't hire anyone who did).
I used them to rehearse with and on stage.

But I lost them and went back to my old standard - rolled up toilet
paper. Low and behold, they sounded better! More natural, and more
reduction of volume.

I've used every type of hearing protection (Ear plugs, the orange
foamy ones, wax, cotton balls, cigarette filters, gun protectors, and
headphones with no signal) and the rolled up toilet paper is always
my favorite. In addition to the good sound, they are available
everywhere, free and always clean.

I'm 50, have played drums with loud music all my life, and can still
hear fine.

Ken Winokur / Alloy Orchestra