EXTRA LARGE COMFORT FOR EVERY SEAT At 18? x 16?, the soft cushion will easily fit in a wheelchair, office chair, lawn chair, bleacher and car EFFECTIVE SUPPORT With a gel core, premium foam layer, a waterproof seal and topped off with a luxuriously soft cover, the 3? thick cushion will relieve back and tailbone pain from sciatica and other conditions DISTRIBUTE PRESSURE EVENLY The liquid gel core redistributes your weight away from high pressure areas like the tailbone and the coccyx where painful sores could develop SUPPORTIVE HIGH QUALITY FOAM The premium foam layer will not flatten under your weight so that you will sit comfortably day after day SPILLS ARE NO PROBLEM With the exclusive waterproof seal, water will never ruin your wheelchair cushion SOFT YET FUNCTIONAL COVER The removable cover is completely washable, water resistant and extremely comfortable