I got a set of decibulz moldable ear plugs. Assuming you don’t want to hear anything, thats the way to go. Me? I want to listen to stuff. Being the ingenuitive lad that I am, I cut the ear canal plugs out and stuffed earbud headphones into them (fits like an oversized replacement tip). I think they do make a version with builtin earbuds, but I was worried they’d rust out eventually or something. This way, any cheapo set will do.
I looked into this last summer as a result of this thread, which you might peruse: