two layers of fabric in front of a dial knit feed the tension of each feed is between about 4 grams and 6 grams this permits a yarn draw of between 94 inches per revolution and 106 inches per revolution of the cylinder however as those skilled in the art will appreciate draw is directly related to the weight per square yard of the fabric the number of channel opening yarns that are inserted is dependent upon the spacing in courses between the tuck stitches however the number and spacing of the channel opening yarns is not critical to the present invention the use of the tuck stitches in combination with the channel opening yarns permits both of the overlying webs to be formed of the same yarn materials and sizes and also eliminates the need for introducing large and small yarns in the fabric construction so as to create channel openings otherwise with the machine setup for forming the bi ply fabric construction certain settings are made for laying in inserting the one to three strands of channel opening yarns between the tucks in the bi ply fabric the cap of the knitting machine is raised to a setting of.