I just wear a pair of earbuds with foam. Allows me to listen to RLM and takes the edge off a tad.
I've been meaning to try this at some point, just haven't gotten there quite yet.
http://www.howtogeek.com/57481/how-t...-ear-monitors/
Here's another...same general idea
http://makezine.com/projects/custom-fit-earbuds/