I have the Athmos and I'm very pleased with it. I always have to fiddle the straps around a lot, but after a lot of fiddling it seems to fit quite nicely. It does take some time, though, and maybe you have to pull the strap that goes backwards (under your ear) and towards the back of the helmet in order to get the length right. This can be a bit troublesome as it's quite tight, but eventually I'm sure you'll get them right. Take care not to get your hair stuck in the little buckle though - I just tried that and it never made it to top five of cleverest things I've done. Trigress pulled the helmet off really quickly - ouch!