I have purchased several packs of these underwear over the last 2-3 years.  They are 100% cotton and stay in place both of which are important if you have sensitive skin.  HOWEVER, I've bought all but one pack directly from Hanes online.  The most recent pack i purchased through Amazon (through one of their vendors as they don't sell it directly), and although the package was not marked as such, it was clear that these were factory "seconds."  Three of the six pairs are much smaller than the others and i will have to throw them away! It seems other commenters have had the same experience.

Although i love the convenience of Amazon, I will buy these from directly Hanes next time.