While the foam type are very effective, but after an hour or so my ears ache from the constant pressure. I use the molded type. They work well.

Using muffs over plugs is a bad idea if you are in the company of others. I do a lot of shooting, high power and var. shotgun, and several times I have witnessed someone with plugs and muffs that could not hear range commands or cautions, and thereby created dangerous situations on the firing line.