Aside from the reversibility, double knit hats are twice as thick and much warmer than your standard knit hat. This is an absolute necessity if you live in the Great White North as I do. If you’ve never tried this technique, I encourage you to give it a chance. It’s a bit tricky in the beginning, but doesn’t take too long to get the hang of it. And it gives you the opportunity to do some color-work in the round, without Faire Isle or Intarsia.