Seat cushions: flat or U-shaped
3 min read · Posture Pillow Co
A seat cushion is a simple thing, and the shape is the whole story. We sell two.
Here is how they compare.
Flat
The Memory Foam Seat Cushion is a flat memory foam cushion, about 17 x 14 x 2 in.
It suits chairs with a flat seat.
U-shaped
The U-Shaped Seat Cushion has a U-shaped cut-out at the back. It is about 18 x 14 x 3 in.
The cut-out is a shape choice, nothing more. It is a gel and latex seat with a polyester cover that is removable and washable.
Fit
Measure your chair seat and compare.
The cushion should not hang over the edge.
Care
Spot clean and follow the label.
Browse our chair cushions or read the size and shape guide.
Choosing between them
Look at the color first: the flat cushion comes in gray, and the U-shaped one comes in blue and royal blue. Then look at the size. The flat one is about 17 x 14 x 2 in and the U-shaped one is about 18 x 14 x 3 in. Place a tape on your chair seat to check. Free US shipping starts at $35, and all sales are final. Place the cushion on the chair for a few minutes and look at how it sits before you decide to keep it. Check that it does not slide on the seat.
Shop the pillows in this guide
Questions and answers
Which is thicker?
The U-shaped cushion is about 3 in, and the flat is about 2 in.
Is the flat cushion thick?
It is about 2 in thick.
More pillow guides
Office chair cushions: lumbar or seat
Pick by shape, size and chair.
Read the guide →
Lumbar cushion sizes
Fitting a cushion to your chair back.
Read the guide →
Set up a tidy home desk and chair
Chair, cushion and desk height basics.
Read the guide →