try...http://www.racerwholesale.com/index.php?cPath=35&osCsid=b5d854514a90c4cd1306cd8bb154ce53
the DOT helmets are junk, snell "M" mean motorcycles, karts, etc, pretty much anything that you can't get burned alive in. The "SA" is for car racing and have flame retardent liners, other than that...