Grades of ABUs I don t really know how to cite the information that I just put in about the grades I found out this info because I am in the Air Force and went to a vendor show today A rep from Dakota Outerwear Company which is a authorized vendor of ABUs showed to me and explained the four grades of ABUs The different in the colors are very slight and hard for even me to tell a color blind person might have problems The difference comes from the fact that the Air Force wanted to lower costs so they used the dyes longer which means that the first batch dipped in the dyes is darker than the 30th batch dipped in the same dyes Therefore making different quality grades Oh and btw they only come in winter wieght That is the only source I can give you on that information Believe it or not I got it from the camels mouth and seen and touched it Keith