I can only say that these are the best, most confortable men underwear any company has ever come op with. I bought several different ones including Emporio Armani, Calvin Klein men underwear, and by far, these are the most comfortable underwear a man could get. I like the 9" series better than the 6" series. Don't be fooled by other high dollar and well known name like Armani or Klein that supposed to be comfortable because it is not the case. Under Armour has enough room for where it matters most and the underwear does not move up in the crotch area, where the others do. I gotta admit, even my wife likes them (ha-ha). You will not be dissapointed with these underwear, for sure.