I bought a pair of Sonic II ear plugs years ago. They claim to have an opening that allows for 'normal speech' to be heard but that 'closes' when loud noise is present. The metal insert that fits into the (I think) silicone is removable and allows the silicone to be cleaned. They have always served me well. They are very comfortable even for long term use. I would readily reccomend them.

Though I don't know exactly where to get them anymore.