found to very closely match the rectangular or diamond open area common to most weave patterns and is also a very good compromise for economy of material and ease of water removal during spinning use of more than four lobes reduces the importance of weft yarn orientation in the fabric but at a cost of more monofilament extrusion difficulty fins with curved or tapered shapes may be used the use and advantages of the invention will be illustrated by the following examples values for woven fabric permeability are determined by measurements utilizing the industry standard frazier permeometer test method and fabric stability measurements are made by determination of the deflection under load of a 10 inch square fabric sample mounted in a hinged frame 1 a papermakers 39 dryer fabric is made utilizing a rectangularly shaped warp yarn with dimensions of 0 35 by 0 53 mm with 53 ends per inch and a weft yarn 0 50 mm in diameter inserted at 32 picks per inch permeability is determined to be 450 cfm and fabric deflection is 0 90 inch denier of this weft is 2500 and the cost is 2 80 per pound 2 a papermakers dryer fabric is made.