The size is approximately 60cm wide x 29cm long. This is a cushion sheet made in the USA using Reflectix with an R-value of 4.0, providing high insulation. (It offers insulation and cushioning superior to Astrofoil E, which has an air layer.) Due to its high insulation performance, it's also effective for use under the feet of those who have cut their Yamato Michi or Evernew mats short. It's also useful when you don't want to sit directly on a frozen bench or damp ground, or when you don't want to put your backpack on damp ground. It's a high-tech sheet with a 7-layer structure, including two air bubble layers, and excellent cushioning. It can be wiped clean immediately if it gets dirty, and sand can be easily brushed off. By folding the dirty side inward, it can be stored inside your backpack. It will be shipped folded in three.