Extra Thick Chair Cushion 18 x 16 x 6 in - Booster Seat for Office

In this review of the Extra Thick Chair Cushion, the bottom line is simple: this cushion is aimed at adults who need a reliable seat lifter and long-session comfort. With an 18 x 16 x 6 in profile filled with shredded memory foam, it primarily solves low seating height and provides a firmer, elevated position that improves driving visibility and desk posture. The reviewer found the cushion effective at raising the sitter and relieving pressure in the hips and lower back, while noting some tradeoffs in long-term firmness retention.

Key Features

• Extra thick design: The 6 in height raises seating level to help shorter drivers or office workers regain sight lines and working height.
• Shredded memory foam fill: A blend of 80% shredded memory foam and 20% polyester provides initial cushioning and a responsive feel that resists immediate bottoming out.
• Ergonomic groove: The center groove reduces hip sliding and helps distribute pressure across the lower back and thighs for longer sitting comfort.
• Portable and secure: A built-in handle and adjustable locking buckle make it easy to move between car, office, and outdoor chairs and keep the cushion from shifting.
• Waterproof PU leather cover: The outer material wipes clean and helps protect the fill from spills while maintaining a tidy appearance.
• Easy care: Spot clean with a damp cloth and mild detergent and dry flat to keep the cushion in good condition.

Who It's For

This cushion is well suited for adults of shorter stature who need an immediate, portable increase in seat height whether driving or working at a desk. It also works for anyone who wants a removable layer of support on an older chair or bench; the 18 x 16 footprint fits most car and office seats.

Those who prefer a very firm, long-lasting orthopedic wedge or who need strict medical-grade pressure relief should look elsewhere, as some users report a softer feel over time and occasional flattening after extended use.

Pros & Cons

Pros

• Comfortable lift that improves driving visibility and desk ergonomics.
• Shredded memory foam blend offers a responsive, cushioning feel without sinking to the bottom immediately.
• Practical features like a handle and buckle make it easy to move and secure in different seats.
• Waterproof PU leather cover cleans easily and presents well in cars and offices.

Cons

• Some customers report the cushion softens or flattens with extended use and can lose height over time.
• A few users mention mixed impressions of material quality and occasional stuffing migration.

Specifications

Dimensions	18 in x 16 in x 6 in
Fill	80% shredded memory foam, 20% polyester
Cover material	Waterproof PU leather
Portability	Built-in handle and adjustable locking buckle
Care	Spot clean with cold water and mild detergent, dry flat
Primary uses	Car booster seat, office chair cushion, outdoor seating

Our Verdict

The Extra Thick Chair Cushion is a practical, portable solution for adults who need extra seat height and a comfortable boost for driving or long desk sessions. It offers thoughtful features like a center groove, handle, and waterproof cover that add real everyday value, though buyers should expect some softening over extended use. For those seeking improved visibility and immediate ergonomic relief, it represents good value.

Frequently Asked Questions

Will this fit most car and office seats?
Yes, the 18 in x 16 in footprint is compatible with most standard car and office chairs and is designed for quick transfer between seats.

How do I clean the cushion?
Spot clean the PU leather cover with a damp cloth and mild detergent, then dry flat; avoid prolonged sun exposure.

Does the cushion keep its height over time?
Initial support is solid due to the shredded memory foam blend, but some users report gradual softening or flattening after extended daily use.