Make Any Chair Your Favorite Chair This cushion has a back and seat pad connected together to double your comfort. Bottom cushion is 4" thick and includes a gel interior to help disperse pressure. Top cushion is 3" and provides a good amount of support and cushioning. Removable fleece cover is washable. Each pad measures 18" x 16"and fits nicely into a variety of chairs when we tested this cushion. Treat yourself to a double dose of seating comfort.