My SensGard hearing protectors arrived very promptly after my order and the next day I took them to my very noisy art studio, which believe it or not is next to a busy railroad track. 

The first test I gave them was with my VERY LOUD shop vac.  I was vacuuming up dirt from some recent work and with the ZEMs on, I could barely hear the vacuum.  It was amazing, I almost couldn't believe it!  The formerly loud vacuum was just barely a hum. 

The ZEMs are so much better than any other hearing protection I've ever tried. 

SensGard's ZEMs are a great invention!  Amazing, so simple, but so effective.  WOW!