18.5 in x 16.5 in Extra Large Memory Foam Cushion - Tailbone Pain

In this review the reviewer looks at an extra large memory foam seat cushion designed for people who sit for long periods. The bottom line is that this cushion is best for anyone who needs targeted pressure relief for the coccyx and wider hip support; its most compelling feature is the combination of a large 18.5 in by 16.5 in footprint and a contoured ergonomic shape that cradles thighs and relieves sit bone pressure. The reviewer found it comfortable for office chairs, car seats and wheelchairs and appreciated the breathable hollow design and removable cover.

Key Features

• Extra large size: The 18.5 in by 16.5 in surface gives more thigh and hip support than standard cushions, reducing hotspots during long sitting sessions.
• Ergonomic zones: Sit bone contours, sculpted leg channels and a pressure relief cutout work together to take pressure off the lower back and coccyx.
• Premium memory foam: Constructed from 100% pure memory foam that balances softness and support to maintain shape under prolonged use.
• Breathable hollow design: The ergonomic hollow and breathable foam help airflow and reduce heat build-up compared with solid cushions.
• Easy care and secure fit: The removable machine-washable cover plus non-slip rubber bottom and retaining strap keep the cushion clean and in place.
• Portable handle: A built-in handle makes it simple to move the cushion between home, office and car.

Who It's For

This cushion is aimed at office workers, drivers and wheelchair users who experience tailbone discomfort, hip pressure or poor posture from long sitting. The extra large footprint makes it particularly well suited to wider chairs or to users who prefer more thigh contact area than standard cushions provide.

People who need a very firm orthopedic wedge or a product prescribed for a medical condition should consult a clinician and may prefer a clinician-recommended device; likewise, those seeking thin or minimalist seat pads for short-term use might find this cushion bulkier than necessary.

Pros & Cons

Pros

• Generous 18.5 in x 16.5 in size provides broader hip and thigh support than typical cushions.
• Ergonomic contours and a pressure relief cutout help reduce coccyx and lower back pressure during long sitting.
• Made from 100% pure memory foam that balances comfort and reliable support while retaining shape.
• Removable, machine-washable cover plus non-slip base and strap for secure placement and easy cleaning.

Cons

• The cushion's 4 in thickness and extra large dimensions may feel bulky on slim or minimalist chairs.
• Users needing an ultra-firm clinical support may find the foam more moderate in firmness.

Specifications

Our Verdict

The 18.5 in x 16.5 in extra large memory foam cushion is a practical, value-oriented choice for people who sit for long stretches and want targeted coccyx and hip relief. Its ergonomic zoning, full-size surface and machine-washable cover make it versatile for office chairs, cars and wheelchairs, while the memory foam offers a comfortable mix of softness and support. For those needing a larger, easy-to-clean cushion that stays in place, it is a solid buy.

Frequently Asked Questions

Will this cushion fit standard office chairs?
Yes; the extra large footprint fits most office chairs but may overhang on very small or slim seats.

Can the cover be machine washed?
The cover is removable and designed to be machine-washable for easy cleaning.

Is the foam too soft for long-term support?
The product uses 100% memory foam that balances softness and support, though users seeking very firm clinical support should consult a specialist.