Just looked at Plaides post re ear plugs:
My Marushin lid is ace, but its BLOODY NOISY in there!!! Mostly wind noise, but nonetheless, terrible for your ears. My commute to work is only 10 minutes, so I don't normally bother with hearing protection, but on a 2 hour weekend ride I use throw-away ear plugs. Very cheap in boxes of 200 from Screwfix or similar - designed for builders/machinists, & do a very good job. I had a pair of re-usable ear plugs, but every time I took my lid off, they almost became embedded in my ear drums!! So, foam throw away items are the way to go....