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The 2-inch-thick Purple Double is the most versatile cushion we tested, with a firm side and a soft side to accommodate different comfort preferences. It is supportive, breathes well, and fits on a variety of chairs.

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The Best Ergonomic Seat Cushions

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This seat cushion is wider and thicker than its rivals, and also much squishier. If it fits your chair and you don’t mind the sponginess, it’s a great value.

Made of dense, thin memory foam, the Tempur-Pedic Seat Cushion encourages better seating posture than completely flat seats or seat cushions because of its contoured design.

Seat Cushion Comparison