ethylene acrylate copolymer vinyl acetate acrylate copolymer and copet binders preferred binder fibers are bi component fibers of the type having an outer sheath and a core an example of such a bi component binder fiber is the high temperature copolyester binder fibers copolyester polyester type tj04bn supplied by teijin fibers limited osaka japan having linear density of 1 7 3 dtex 1 53 2 7 denier length of 5 15 millimeters and sheath melting temperature of about 150 u00b0 c other examples of binder fibers that may be used include type 7080 crystalline bicomponent copet pet fibers available from unitika fibers ltd osaka japan having a linear density of 2 0 denier a length of 5 mm and a sheath melt temperature of 160 u00b0 c and kuraray type n720h melting temperature 150 u00b0 c in preferred embodiments binder fibers should be present in the bottom layer in an amount of about 5 to 15 by weight in dry state of the bottom layer preferred nanonfibrillated lyocell fibers 12 used in the substrate are fibers formed by dissolving and extruding naturally occurring cellulosic materials such that the chemical nature of the naturally occurring cellulosic material is retained after the fiber formation process and the length diameter and morphology of the extruded fiber may be controlled therefore preferred lyocell fibers are synthetic fibers as defined herein during fiber formation lyocell fibers 12 typically fibrillate or form micro fibrils or nano fibrils on the fiber surface and fill in gaps in the top layer left by the conjugated fibers 14 or microfibers 16 during wet laid processing as shown in fig1 and 2 a preferred lyocell fiber is a nano fibrillated fiber available from engineered fibers technology in longmeadow mass under.