Our Aspen Snow Cool Pads are made with Grid-Flo stitching. This creates an even flow of water throughout the pad. It also prevents sagging. This delivers cool air more efficiently. We use natural aspen wood excelsior Fiber is layered into a uniform thick mat Stitching secures the mat to the netting for stability Each stitching seam runs the entire length of the pad A set of 4 pads, 32 in. x 36 in.