A disposable wearable absorbent article having a hook and loop fastening system that comprises a nonwoven female fastening material and a male fastening material with a plurality of bidirectional micro-sized hooks, each having a cap and at least one arm. The height of each hook and cap may be defined relative to the overall thickness of the female fastening material. Caps may have a vertical engagement effective area that has: (a) at least two sides that are substantially parallel (b) a width-to-thickness aspect ratio from 1 to 2 and (c) an area from 40,000 to 120,000 &mu2. Caps may have an overall recessed width and a deepest recessed depth that is defined relative to the overall fiber cross-sectional dimension.
