2pc Foam Pad Seat Cushions - Pair of Ergonomic Covers (Black) Easily attaches to most chairs and car seats with an elastic strap to wrap around Great for car seats, home or office chairs Great for placement on seats that are too hot or too cold Measurements for both cushions: Top Portion: 20" x 18.25" Bottom Portion: 17" x 18.25" 3/8" Foam Padding reduces back tension, aches and pains