to both hydrophilic as well as hydrophobic materials of construction although polyester which is hydrophobic may be particularly preferred in order to evaluate the relative performance of a mop head formed according to the present invention exemplary mop heads formed with fluid retaining strands having elongate channel depressions and raised profile protrusions were weighed in a dry state and were thereafter immersed in water until fully saturated and then weighed in a wet state once dripping had substantially ceased the contoured surface mop heads were formed according to the potentially preferred practice as described above on a 1 5 inch diameter circular knitting head with an arrangement of four needles in and two needles out repeated eight times around the circumference mop heads of similar construction but incorporating flat surface tubular strands of knit material formed on the same knitting head but with all needles in were tested according to the same procedure each of the structures was also tested to measure sorbency in a wet state wherein the wet mop was immersed after wringing excess moisture from the mop head following initial saturation the results are set forth in table i below as can be seen the mop structure of the present invention exhibited substantially greater intrinsic sorbent capacity in both the wet and dry states relative the prior structure using flat tube fluid containment strands while the present invention.