Pad for use in a critical environment

A pad for use in a clean room environment, the pad having:

• a first surface, a second surface opposite the first surface, and a thickness;
• the first surface having a plurality of raised nubs and a plurality of recessed troughs wherein the nubs are arranged adjacent each other forming laterally alternating rows with the troughs interspersed between the adjacent nubs and divided into a first group of substantially parallel troughs and a second group of substantially parallel troughs which first and second groups of parallel troughs cross one another forming a hatch pattern;
• each nub has a length and a width wherein the length is greater than the width, and a substantially diamond-shaped top having a periphery and two major angles disposed opposite each other widthwise and two minor angles disposed opposite each other lengthwise wherein each angle is rounded;
• and
• each trough has a bottom and two sides flanking the bottom and extending upward to meet the tops of the nubs adjacent each trough forming an edge along the periphery of the top of each nub.