Just got these in the mail yesterday Surefire EP3 and EP6 they are essentially the same, with the EP6 being black, and the EP3 being a Clear colour. for the purposes of the review i will just talk about the EP6 I bought the medium size ones, I bought them from Platatac (australian dealer) and they told me that medium fit most people, small suit kids, and the big ones, are for people with larger ears. the Medium fit me ok, but are a little large for my wife's ears (i will get her a pair of small soon) EDIT - they fit her ears ok, they just take a bit of wiggling to get them in comfortably due to the odd shape of her ears From what i can find online they have a NRR (noise reduction rating) of 8 without the stoppers, and 16 with the stoppers in. with the stoppers in, they are as quiet as normal foam squashy earplugs. with the stoppers out, they deaden loud noise, but still let you hear talking, i will update this review after i have used them at a Concert, and at the racetrack with loud noise around. they are very comfortable, if you can wear canalphones or normal foam ear plugs comfortably, then these will be no problem. they also lock into the ear very well, i would have no problem pulling a helmet or balaclava over them and them staying in.