Our Puddle Pads are an organic alternative for mattress protectors. They are 1/4" thick, which means they won’t change the feel of your mattress! Because they are needle-punched, the certified organic wool is tight knit to the point were it is nearly water-proof. Be sure to front load machine wash or hand wash on cold and line dry, since machine drying might cause separation of the wool. Top load washers may ruin the pad.