The Patchwork Navy is a premium fabric which costs a little more. This is a thicker, more rugged fabric that is often also used for zabuton (sitting cushions) and kotatatsu-buton (low table covers) because of its strength and durability. The patchwork pattern harkens back to the origins of futon when the outer shell materials used in making futon were simply worn-out kimonos that the Japanese women patched together to make futon for their families. Kimono fabric is a very high quality fabric with beautiful patterns. This is why the tradition of shikibuton -- or wabuton (traditional futon) --making is still to make them beautiful even when they get covered with a traditional white cover. Along with fabrics made specifically for futon, we still do occasionally use kimono fabrics for our futon.