I use a custom fit pair of Decibull earplugs. I have remolded them many times as my ears have changed shape. They are more comfortable than regular earbuds but they still block out just as much, if not more sound. They have served me well for over three years.
this is what they look like when they come out of the box. You can also choose from three other colors. The tips have many sizes and the back plugs, for lack of a better word, have many different attachments for different situations.