used to have a similar prob lem, found that cotton terry and bamboo terry were the quickest to absorb hosepipe wees and then hemp either lower or between nappy and wrap. anything less than 3 layers of bamboo or cotton terry didn't absorb as quick as boo could wee it!!
bamboo is slimmer than cotton, but also feels very squishy when wet,,,and boo had some on reaction to wet bamboo terry...but he is a very sensitive child!!!!
oh, and had to loose the fleece for a while is it was too slow to lllet the wee pass thru...went for the boots disp liners which are very soft and yummy