Thank you for viewing. The fabric is somewhat thin. It may be cotton. As far as I can see, there is no damage in the middle, but there are some black-brown "dots" on one part of the edge. Extension is possible, but in the case of extension (¥1700), there is still damage only on the edge. Please refrain from purchasing if you are concerned. Extension is possible up to 114 x 90 (3 pieces for ¥2500).