Free Capillary Matting

last year I bought some Moisture/Capillary Matting Watering/Greenhouse off ebay and paid through the nose for it.

This year I deconstructed an old single mattress that needed to be taken to the dump and found that the same rag cloth is used on top of the springs once you take the mattress cover off. 

I've ended up with 8 double gravel tray mats and 14 seed tray mats with enough over for all the half, quarter trays and propagator trays