I bought these on the off chance they would work good enough for the few times I use loud machines i.e. metal cutting chop saw and circular saw. I am pleased to say that this pair of defenders is well worth the money I paid.You need to look at the decibel rating to judge if ANY pair will perform as you expect, these have a rating of 35DB. The higher the number, the more noise they should cut out. Cutting metal with a chop saw gives a lot of high pitched "screaming" in your ears I find, so a rating of 35DB is ideal for me. Indeed, using my milwaukee metal cutting circular saw is now a delight, rather than an ordeal for my ears. Any ear defenders will help, but look for the decibel rating to help judge the level of protection. They are a reasonably tight fit on your head (mine is a largish size of head) but wearing this model for a long time is ok and not too tight for it to be distracting too much. Once I tried it, i realised I would never go without them again, if I could help it.I highly recommend these ear defenders, but ANY type of ear defenders are better than none, just look for the rating number for noise reduction.