A deep 2" of ultra-plush supportive WonderGel provides that much-needed pressure relief and support. Perfect for home and office, the Extreme Gel cushion is also very popular among professional truckers. It provides comfortable support while eliminating pressure spikes, letting you sit hours longer comfortably. Comes with a deluxe,black, zippered, washable stretch cover with a non-skid base and a convenient carrying handle. 16" x 18".