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As I understand it there is basically two typs of damage, constant noise ie grinder machinery concert, which your ears can protect themselves from for about an hour then damage is slowly but surly...

Describe said exercize please gapped axe

There is a pic of some dork wearing some way back in the thar trip thread and i think also Dougi e s first kills thread

Yep defiantly some white noise helps with the sleeping. I find a fan on low good. Especially in summer;-)

They are good aye Dougie(especially if its cold;)) you can turn em up to hear more than normal and still have hearing protection.
Still cant see me wearing them in the bush tho.

+1 Iv been in a noisy environment all my working life (very simmilar to yours for a lot of it spanners) plus messing with explosives as a kid(what else do you do on a farm) motorcross bikes, v8s with...