I’ve just looked around, and it seems that Giro’s MTB helmets don’t ever come in plain red, but bright orange is a common colour. I recently bought a Xar for commuting, and went for fluorescent green as orange was out of stock (it still looks ace though).
When I checked Chain Reaction’s product view ‘filter’, interestingly, the Fathom was presented when I selected both ‘Red’ and ‘Orange’ whereas this filter seemed to differentiate between other models/makes – so something is clearly confusing the retailers a bit. But to be honest, you should have realised that Giro MTB stuff is orange, and not red.
Anyway, now that you have a bright helmet:
1) You’ll be better seen on the road
2) Mountain Rescue will have a better chance of finding you if the worst comes to the worst…
so be happy with it – it’s really good 🙂