This high-density memory foam cushion is designed with a rear U-shaped cutout to minimize pressure on the tailbone during long periods of sitting. With over 105,000 ratings and a consistent top-seller status, it is a popular aftermarket solution for office chairs and car seats, though its three-inch thickness requires users to adjust their seating height and pedal reach.
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| Design | U-shaped cutout at the back to take pressure off the tailbone area |
|---|---|
| Fill | 100 percent memory foam core |
| Size | Large: about 17.3 x 14 x 3.15 inches, roughly 1.5 lbs |
| Cover | Breathable mesh cover, removable and machine washable |
| Base | Non-slip bottom |
| Uses | Office and desk chairs, gaming chairs, car and truck seats, airplane and stadium seats |
| Amazon Rating | 4.4 stars, 105,400-plus ratings, #1 in Automotive Seat Cushions and #1 in Back and Seat Cushions, 10K+ bought in the past month |
The cushion features a 100 percent memory foam core with a specific U-shaped cutout at the rear, intended to suspend the coccyx and reduce direct pressure. It measures approximately 17.3 x 14 inches with a 3.15-inch thickness, making it a substantial addition to most chairs. The exterior is a breathable black mesh cover that helps with airflow, while the underside is finished with a non-slip rubberized texture to keep the unit stable during movement. At roughly 1.5 lbs, it remains lightweight enough for daily transport between a home office and a vehicle.
Proper orientation is critical for this cushion; the U-shaped cutout must face the back of the chair to function as intended. Because the cushion adds over three inches of height, owners report the need to lower their office chairs or adjust their car seat tracks to maintain safe access to pedals and clear headroom. In automotive settings, reviewers suggest ensuring the non-slip base is firmly seated to prevent shifting during turns.
The most common feedback from the massive user base of over 105,000 owners is the cushion's ability to retain its shape under weight; unlike lower-cost foam pads, this unit does not easily bottom out. While many owners report it successfully eased tailbone discomfort during long shifts, the firmness is a point of contention. Some find the support perfect for long-duration sitting, while others feel it is too hard. Additionally, memory foam is temperature-sensitive; several reviewers note that in winter months, the cushion feels very stiff when first entering a cold car, only softening once it absorbs body heat.
Patterns pulled from verified owner reviews, not our own usage log.
David Kim
Last updated: October 4, 2026
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Everlasting Comfort
Memory Foam Seat Cushion for Office Chair and Car
Written from in-depth product research
Everlasting Comfort
Memory Foam Seat Cushion for Office Chair and Car
Written from in-depth product research