I work a lot in a wood shop/metal shop. I’ve always been a big proponent of ear protection. Recently, I’ve been using shure in ear monitors for blocking small sounds and supplementing with ear muffs when real tools are on. However, I’ve started to just wear those in ear monitors around even without listening to anything. The ear plug feature is actually really great. I can get on muni or bart in the Bay Area with them and listen to a book at 3-4 clicks of iPhone volume. It’s pretty great to get used to things being quiet.