The answer to the riddle "What gets wetter and wetter the more it dries?" is a towel. When a towel becomes wet, it absorbs water and appears to be wet. However, as the moisture evaporates, the towel becomes drier and in need of more moisture. Therefore, a towel gets wetter and wetter the more it dries. This riddle relies on wordplay and the reader's understanding of the properties of a towel.