They use Daiya "cheese" which really does melt. It is fairly cheesy too. It's not so mozzarella-ey, it feels/tastes more like a soft cheese to me but it's not too soft or greasy and the pizza crust stays crisp. I picked this pizza up from Fortinos for only $10. Not too bad for specialty vegan food. It only takes 12 minutes to bake too. Yay!