The Calvin Klein Micro Modal Lyrca Trunk U5554 is the most comfortable underwear youll ever wear! No wonder its one of the brands best-sellers. Modal is a natural fabric that feels super soft and silky against your skin. Once you put this trunk on, it feels like youre not wearing much of anything, yet the snug fit gives you support where you need it. The fabric is more resilient and absorbent than cotton, and glides over your skin for a sleek, defining fit.