Scuba helmet? I'm not going diving TP. Ha ha. Have to say I've never heard of them.
Local places sells Arai, AGV, Shoei and so on and they have a cut away Shoei. It's just polystyrene inside. Nothing clever, just Styrofoam. So that's 1o pence. What's the other £499? Well there are features of course, the shell is made of better materials and they'll have spent time in wind tunnels getting it as quiet as possible, but I figure underneath there's little different between them. Light, yes. Quiet, yes, Protect my head, yes. Ventilation, yes - but just what do I HAVE to spend to get those and at which point is someone genuinely taking the pi**
£100? £200? £300? £800? They all seem to have the same standard on the label. There aren't any that say safe up to 50mph or safe over £100mph. Given that I'm not buying a track bike to do the TT in, I'm sure that I don't need to spend £1000 on one.
OK OK you can't take chances. But look at old Schumacher. I bet his lid cost more than that and look what good it did him. The question is what is a realistic spend before you really aren't getting anything more for your money? Drop it and it's scrap. After 5 years it should be binned regardless. I need shares in a helmet company.