I have had a couple of sets of these over the last 10 years:
http://www.envirosafetyproducts.com/...o-earmuff.html
Light weight and they work great. I've worn them for many hundreds of hours and like them a lot. They have an MP3 input too. I got tired of ripping my ear bud cord off while working and have been happy to have switched to these. They are a lot easier to adjust than digging out whatever mp3 source you have to set the volume or change the selection/station.
I've had the wires break on both sets where they come out of the earcups. Not hard to fix, but I wish they would change the design. It looks like the newest version of these still uses the same flat ribbon cable.