i wear earplugs 24/7. i use disposables now, but there are issues. i wonder if there are any soft earplugs made out of a safe material. my old respirator had a soft silicone that would retain its shape. like that. [edit: i mean that it would RETURN to its DEFAULT shape and not squish around until it fails to work or whatever!] foam has formaldehyde. i use mack's silicone earplugs, but they are hard and do not revert to default shape. i go through 1-2 per day in each ear. also they have slippery substance. also i have no idea if they are safe [for examlpe, i don't know the result of the silicone breast implants thing]. so i am asking for soft safe /reusable/ earplugs i guess.