One reason futon slipcovers are so popular is because you can change the color of your futon whenever you want! Say you have a brown futon with a white slipcover. If you get bored of the white look, you can remove it and have a brown futon. Or you could purchase another slipcover color to freshen up your space. This keeps your futon looking new and clean. If you want a completely different style of futon, you could donate or sell the one you have to buy a new one. Since they are fairly inexpensive, it's an easy piece of furniture to update every so often.