Is this cushion soft or firm?

It is made of high-density polyurethane foam, which leans toward firm support to prevent bottoming out.

What are the exact dimensions?

The cushion measures 18 inches wide by 16 inches long, fitting most standard office and dining chairs.

Can the cover be cleaned?

Yes, the polyester cover features a zipper and is safe for machine washing.

Does it work for sciatica?

While designed for the coccyx, the elevation can help reduce general nerve pressure, though results vary by user.

Where is the DMI Polyurethane Foam Coccyx Seat cheapest?

At Staples, for $26.99, as of our latest check.

DMI Polyurethane Foam Coccyx Seat

Best price now

$26.99at StaplesObserved at 1:33 AM

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Our take on the DMI Polyurethane Foam Coccyx Seat

This 18-inch wide polyurethane foam cushion features a rear cutout designed to relieve pressure on the tailbone during long periods of sitting. It includes a removable, machine-washable polyester cover for easy maintenance. At $26.99 at Staples as of November 7, 2026, it sits at a standard entry-level price for orthopedic foam supports.

Best forOffice workers with lower back painRecovery from tailbone injuriesAdding firm support to hard chairsBudget-conscious ergonomic upgrades

Pros

U-shaped cutout reduces spinal pressure
Lightweight and portable for travel
Removable cover is machine washable
Retains shape better than soft fiber fills

Cons

Foam may be too firm for lightweight users
Lacks a non-slip bottom surface

DMI Polyurethane Foam Coccyx Seat prices at every store

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In stock
$26.99Free shippingObserved at 1:33 AM
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DMI Polyurethane Foam Coccyx Seat price history

Lowest price we've seen: $26.99 on Nov 7 at Staples. Tracked across 1 store since Nov 7.

What reviewers say

Users generally find this cushion effective for acute tailbone pain, though its firmness is a polarizing factor. It is frequently cited as a functional, no-frills solution for office chairs and car seats.

What people mention

FirmnessMixedSome users appreciate the rigid support for spinal alignment, while others find it too hard for long-term comfort.
PortabilityPraisedThe lightweight foam construction makes it easy to move between a home office and a vehicle.
Cover MaterialPraisedThe polyester cover is noted for being simple to remove and holding up well after multiple washes.

Questions and answers

Is this cushion soft or firm?: It is made of high-density polyurethane foam, which leans toward firm support to prevent bottoming out.
What are the exact dimensions?: The cushion measures 18 inches wide by 16 inches long, fitting most standard office and dining chairs.
Can the cover be cleaned?: Yes, the polyester cover features a zipper and is safe for machine washing.
Does it work for sciatica?: While designed for the coccyx, the elevation can help reduce general nerve pressure, though results vary by user.
Where is the DMI Polyurethane Foam Coccyx Seat cheapest?: At Staples, for $26.99, as of our latest check.