CONSTRUCTED WITH THE IDEAL COMBINATION OF LIGHTWEIGHT COMFORT AND TECHNICAL PERFORMANCE PROPERTIES, THE WASHABLE, TRIPLE DENSITY FOAM CUSHION FOOTBED PROVIDES A MASSAGE AS WELL AS PREMIUM ODOR CONTROL DURING ALL DAY PLAY. SIMPLY REMOVE THE LINER FROM YOUR SHOE, MACHINE WASH AS NEEDED, AIR DRY, AND THEN INSERT YOUR REPLACEMENT LINER FOR A PREMIUM MASSAGE WITH EVERY STEP.