The present invention thin the two single-sided pile knitted fabric is superimposed as pile surface is on the outside, three-layer to insert a double Russell sheet for air layer secured, and was integrated by sewing machine sewing in between two sheets to provide a highly breathable mat due to the structure. A multi-layer structure made of polyester fibers 100% of the thickness has been sewing machine sewing by sandwiching a piece of double-Russell mesh sheet 402 of 1mm~5mm between two sheets of the thin single-sided pile knitted fabric 401 and 403 It is a fabric. In addition, thin single-sided pile fabric 401 and 403 blended rate of cotton 40 percent or more, often equal to or less than 60% polyester, yarn count cotton yarn is 20S~40S, polyester yarn may if 100D~200D. .BACKGROUND 4
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