Fabric (mostly cotton with a little elastane I suspect) is comfortable.  Slightly tight around the thighs but not always a bad thing.  But what I can't understand, is in this modern age of tagless clothes, why these underwear would ship with multiple massive tags on the back.  Plus, trying to cut them off, I put a hole in one of the underwear already.  What a waste.  Calvin Klein, please catch a clue.
--Not recommended--