Both volume and sound quality.- Noise reduction is GREAT on these.- Very snug fit

They work just as well as normal earmuffs, maybe just a little worse, but the noise reduction is SUPER!!

Without any music playing the Passive Noise Reduction of the headphones blocks most noises, you can still hear some loud noises (ex. from the construction side next to my building) but become very soft

Outside noise reduction is EXCELLENT!

Noise reduction works extremely well!!!

The Noise Reduction is very nice too

These are passive noise reduction headphones, so they are big and bulky.

Noise reduction is very good

Great noise reduction, they are comfortable and the best part

Noise reduction is good

The noise reduction is very good.

Yes, I may look like a metal detecting grandma, but I can't hear the Beats By Dre haters through these awesome noise canceling headphones.(Note that the static I initially reported went

Yes, I may look like a metal detecting grandma, but I can't hear the Beats By Dre haters through these awesome noise canceling headphones.(Note that the static I initially reported went