What is Earthwool and how is it different to other insulation products? Earthwool insulation can’t compare to the glasswool insulation that was on the market a few decades ago. Even though most fibreglass insulation that is produced today is much improved compared to the ‘old days’, Earthwool still seems to have a couple of advantages over the rest. It’s considered the softest of them all and many professional installers claim it doesn’t itch at all.