I have been buying and using auto and motorcycle helmets for many years and really don't know much about them. Most people I talk to about this subject, seem to have the same level of knowledge. Most of us prefer one brand or another, but with no real good reasons why, except the particular brand is the one they are accustomed to using. Today's rating requirements would suggest that we should purchase a Snell SA-2005 or better helmet for auto racing purposes. I have always purchased the more recognized brands like Simpson, Impact, G-Force and so on. There are so many helmet manufacturers out there and the price varies from less than $200.00 to $1500.00 all for helmets that have the exact same safety rating of SA-2005 and all promise high quality, comfortable fit, etc. Yes, they differ by the material used to construct, like carbon fiber or un-named composites, or by the type of venting systems used, but do they really vary in how safe they are and the level of protection they provide? Is a basic, white, composite helmet, without air induction inlets, or other bells and whistles, from maker "A" that sells for the lowest price any mor safe or better than the one that cost many times that amount?