Purflo Sleep Surface (140 X 70) Specification.. We also make available a separate additional SleepSurface, separately packaged, so that you can keep your nursery in top hygienic conditions.   The idea is that you can have one SleepSurface on the mattress frame and being used, whilst one is being or has been just washed. In this way you can ensure that your baby always has fully laundered bedding ready when it is required - maybe in the middle of the night!!