This is a very rare example of a goza mat sewn onto the back of an indigo-dyed Boro textile that has been sewn together.
 
"goza" typically refers to a type of traditional Japanese mat made from woven straw or reed. These mats, known as "tatami," are commonly used as flooring in Japanese homes, particularly in traditional-style rooms called "washitsu."
 
This indigo part was made of some cotton length which was reinforced by hand Sashiko stitching.  It has been washed many times so it has a soft texture.
 
Mesures: 174cm×86cm (68in × 33in)