TranquilRelax MPN-TR0001-L-BL XL Memory Foam Seat Cushion, 3.35-Inch

At 18.5" x 16.92", this extra-large seat cushion pairs memory foam with a 3.35-inch height boost. Its medium-firm feel is designed for steady support during extended sitting. A beveled front edge and breathable mesh cover add practical details for daily use. Choose it when you want added seat height and structured support rather than a plush, sink-in cushion.

Spec sheet

• Type: Extra-large seat cushion
• Model: MPN-TR0001-L-BL
• Fill: Memory foam
• Size: 18.5" L x 16.92" W
• Height boost: 3.35 inches
• Firmness: Medium-firm
• Cover: Removable, zippered 100% polyester mesh
• Base: Non-slip rubber
• Color: Black
• Care: Machine wash the cover on a cold, gentle cycle. Do not bleach or tumble dry, air dry completely before reuse. The memory foam core is not washable.

Compatibility

Use it on an office chair, car seat, dining chair, or wheelchair when you want a raised sitting position and a supportive surface. The added height can be useful for shorter drivers seeking a higher view from the seat, while the portable format also suits work-from-home setups, reading, travel, and other casual sitting. Its rectangular shape and extra-large surface provide room for adult use across these settings.

The beveled edge is designed to support a more upright seated posture and help distribute weight around the hips and thighs. The cushion also targets the tailbone and sciatic area, making its shape relevant for people who spend long periods at a desk or behind the wheel. For a daily work setup, place it on the chair before settling in, for a drive, position it on the car seat to add height and support. The rubber base is intended to help keep the cushion in place as you sit.

Getting the most from it

The medium-firm feel is a defining part of this cushion’s design: it provides a more structured sitting surface than a soft, plush pad. Buyers describe it as comfortable and supportive for extended sitting, including at a desk, though opinions on firmness vary, with some finding it harder than they prefer. Feedback on stability also differs, the cushion has a non-slip base, while some buyers report that it stays put and others say it can move. These varied impressions make firmness preference and seating setup useful considerations when choosing a cushion.

For easy care, unzip and remove the mesh cover before washing it on a cold, gentle cycle. Let it air dry completely before putting it back on. Keeping the foam core out of the wash helps you care for the removable cover without treating the cushion itself as machine washable.

Should you buy it?

It’s a great fit if you want to add seat height while keeping a supportive, medium-firm feel for a desk chair, car seat, or another everyday seat. The extra-large surface, beveled shape, removable washable cover, and non-slip rubber base bring together comfort-focused design and practical upkeep. Choose it for long work sessions, regular driving, or other seated routines where a raised position and a defined support surface are the priority.