ester resin manufactured by dow chemical company using approximately 2 5 weight percent methyl ethyl ketone peroxide as a catalyst approximately 0 40 weight percent cobalt naphthenate as a promoter and approximately 0 10 weight percent dimethylaniline as an accelerator the rigid and flexible resins differ in the degree of reinforcement and lamination the rigid resin is reinforced and laminated with approximately twenty layers of hexcel corporation graphite fabric having 716 fabric style plain weave 4 7 ozs per square yard weight 0 006 inch thickness 16 u00d7 16 warp fill 3k warp 75 1 0 fill yarn undirectional graphite fabric glass fill the graphite fabric is laid such that all twenty sheets run the length of the rigid resin plate the flexible resin plate is also derakane 8084 reinforced with approximately ten sheets of hexcel graphite fabric the result is that the rigid resin plate has a thickness of approximately 0 225 inch whereas the flexible plate has a thickness of approximately 0 110 inch the sole of the shoe is standard leather or synthetic a leather insert may be used to cover the sole strengthener plate 124 foam insert 130 is typically closed cell ethylene vinyl acetate having a compression deflection in the range of 3 5 to 6 5 psi and a density of 2 5 to 3 5 lb cu ft adhesives as known in the shoe art are used for.