JUST INSERT INSIDE ZIPPERED CUSHION. Before you order watch our video for a tutorial on how to properly insert SagsAway inside your zippered cushion cover. Never place under the cushion SAVE MONEY, MAXIMIZE THE LIFE OF YOUR SOFA. Replacing cushion cores is costly. SagsAway compresses the foam, not down cushions, restoring thickness and comfort for a fraction of the cost to replace 2 PIECE KIT TO RESTORE ANY SAGGING FOAM SOFA CUSHION. Each kit includes two 1.5 inch thick pieces measuring...