We do NOT sell any type of knock off or unauthentice merchandise, and I do wish you would ask that question before you publicly would say something like that. As a US based small business we would never do such a thing. If you had asked, I would have explained that for the last two years SImply Southern has been doing some shirts, long sleeve and short, in lighter weight materials. They told us that this was because people were asking for that. They do not do all of them and are not planning on doing that from my understanding, but they do have different styles coming in on a lighter weight blank, as the one that you purchased.