It's best to go into a shop and see what helmet fits your head shape the best; all helmets are shaped a little differently, and some helmets will line up better with different goggles. Personally, I found the smith maze to work excellently with my I/O's. The two line up very well, and it's also the lightest safety certified helmet on the market. I can barely tell when it's on my head it's so light.
"What you are feeling is a base burn. The toilet bowl cleaner probably has a really high pH , and therefore must be neutralized with an acid that has a really low pH. So basically, you just need to stuff your asshole with the most acidic shit you can find, battery acid, sulfuric acid, nitric acid, whatever you can get your hands on. its gonna be a chemical showdown in your asshole today my friend."