may be an extruded rubber yarn of 22 gauge although other stretchable yarns of various gauges such as 28 or 34 gauge could also be employed depending on the particular end use of elastic webbing 10 filling yarn 14 may consist of a 1200 denier polypropylene yarn of the brief continuous filament type and as shown a second parallel filling yarn 14 39 is seen beneath top filling yarn 14 as would be understood elastic webbing 10 will stretch or elongate along its longitudinal axis walewise a controlled amount for example up to 120 of its normal relaxed length other elastomeric yarns having less elasticity and other knitting constructions can be employed which will further limit the walewise elongation as just described as elastic webbing 10 is used in furniture structures for example in seat webbing it must carry a high load when used on sofa frames where 3 or more adults may sit simultaneously thus to prevent undue elongation and to strengthen elastic webbing 10 control yarn 15 is employed which is knit between parallel filling yarns 14 14 39 and between said filling yarns 14 14 39 control yarn 15 may be for example a 1000 denier fibulated polypropylene yarn although other strong yarn types and sizes could be utilized depending on the particular end use intended for elastic webbing 10 as further shown in fig2 control yarns 15 are knit beside elastomeric yarns 13 where they cross elastomeric yarns 13 every 2 walewise stitch loops 17 as elastic webbing 10 is stretched in a walewise direction control yarns 15 become taut until further stretching is not possible control yarns 15 alternate in passing along the top and bottom surfaces of adjacent elastomeric yarns 13 as.