we have a couple of fluffies; one i purchased and one was given to me. the fit was fine on Lily, we never had a leak but we always used pul covers and changed very regularly. The velcro used is not terrific and the loop part of it lost its effectiveness despite not really getting a lot of wear. At the mid to larger end of the weight scale for the nappythe velcro was simply not effective enough to keep the nappy done up. The absorbency is a factor and I chose to not buy any more and stuck with terry flats for 10 months.
Construction wise, I have pulled one apart and it consists of two full body layers of terry; and two wet zone layers sandwiching a piece of wadding.
I have added the aforementioned nappy to to Geelong Nappy kit
HTH