And I have tried a ton of "sound blockers". Everything from the little, rubbery, yellow standard ones that many production workplaces have to various headphones (over the ears and in the ears). You roll these to make them smaller like the yellow ear plugs and then insert them (they're made of foam). As they slowly filled my ears, the sound went almost completely away.

My usage for earplugs is to block out co-workers talking and the flurry of PC keyboard typing that occurs when people go on an IM rampage. Whenever I use my headphones with my MP3 player, I can always still hear almost all of the typing and quite a bit of the chatter. When I put these in, the software support guy I can ALWAYS hear (he speaks loud due to hearing loss) was slowly drowned out until all I could hear was a vague droning of speech. I was amazed! I could never shut that guy out before.

The co-worker in the cube behind me loves to IM another co-worker and she has really long fingernails that clack as she types. Very annoying when done quickly and for long periods of time. Her typing went away so well that I thought she had stopped typing until I removed the earplugs. My OWN typing is nearly silent as well.

I just can't say enough about these ear plugs. Seriously, considering the price, they're the best purchase I've made in ages!

My husband snores. Loudly. I have been wearing earplugs to bed for years, tried every kind out there. This brand is the KING of all earplugs--comfortable, and truly blocks out the noise like no others. I wish I could buy them by the case!

These "comfort" ear plugs are about the best you can find, but the problem is they are not compatible with all ears. If you want a lot of silence (like when asleep) then you'll have to push the foam way inside, otherwise the standard foam shape will leave open spaces. But I don't recommend pushing the foam inside because of the air pressure involved which could damage the eardrum.
For those who just need less noise while in a busy environment, I'm sure these will do since they reduce sound 30%-40%. But not recommended for anyone hoping to block out noisy environments while sleeping.