This is included when you purchase a single size futon cover from Sleepy Inari. How about a spare? It has an elastic opening and is a slip-on type. It is not a zipper type. Of the four, one was opened to check the material, but it has not been used. The color is a pale uguisu color, or perhaps... a color that is a mix of beige and green. The fabric is thin, so the color may appear even lighter when actually put on the futon.