The Best Office Chair Cushions

The ComfiLife Gel Enhanced Seat Cushion is the seat cushion most people should start with. It's high-density memory foam with a cooling gel layer on top, and a U-shaped cutout at the back leaves open space under your tailbone. At about 17.6 by 13.8 in and 2.75 in thick, it fits most standard office chair seats.

The velour cover zips off and goes in the washing machine. A studded rubber bottom helps stop it sliding around, and a built-in handle makes it easy to carry to the car or another chair. It comes in several colors, and ComfiLife backs it with a lifetime warranty plus a money-back or replacement guarantee.

It's still foam, so it won't breathe like a grid cushion, and like most memory foam it feels firmer when the room is cold. It also adds close to 3 in of height, so you may need to lower your chair. For a comfortable, well-made cushion with strong coverage, it's our pick. Check the current price of the ComfiLife Gel Enhanced Seat Cushion on Amazon.

The Purple Double Seat Cushion takes a different approach from foam. Inside the cover is Purple's GelFlex Grid, a flexible web of open cells with air channels running through it. It has two sides with different feels, so you can flip it when you want a softer or firmer sit, and Purple pitches it at people who spend long days at a desk.

It measures 18 by 16 by 2 in, larger than the foam cushions here, and weighs 5 lb. The cover comes off for a cold machine wash, the cushion itself can be hand washed, built-in handles make it easy to move, and the bottom is grippy. Purple offers a 30-day trial and a 1-year warranty.

It's heavier than foam and costs more, and the 1-year warranty trails ComfiLife's lifetime coverage. Purple's own pages also describe which side is firmer in different ways, so try both before you decide. If memory foam feels too warm or too soft for you, it's the one to get. check the current price of the Purple Double Seat Cushion on Amazon.

The ComfiLife Lumbar Support Pillow is the lumbar pick for most people. It's high-density memory foam and measures 17.5 by 16 by 5 in, thick enough to fill the gap between your lower back and a flat or worn backrest.

Three adjustable straps, plus extension straps, let you fix it at the right height on office chairs and car seats. The cover blends leatherette with breathable mesh, and ComfiLife backs it with a lifetime warranty and a money-back or replacement guarantee.

At 5 in thick, it moves you forward in the seat. That can feel like too much on chairs that already have a lumbar curve, or if your seat is shallow. If that sounds like your chair, the slimmer Purple Back Cushion is a better fit. On a flat-backed chair, it adds a lot of support. check the current price of the ComfiLife Lumbar Support Pillow on Amazon.

The Everlasting Comfort Memory Foam Seat Cushion is one of the best-known seat cushions around, with more than 12,000 reviews on the maker's own site. It's a contoured memory-foam cushion designed for office chairs, and the foam is CertiPUR-US certified.

The breathable cover unzips and goes in the washing machine, while the foam core should be spot cleaned and air dried. It comes in several colors, and Everlasting Comfort backs it with a lifetime warranty against defects.

Everlasting Comfort doesn't list dimensions on its product page, so check the size against your chair on the Amazon listing before you buy. Like other foam cushions, it can hold heat on long days, and it lacks the gel layer the ComfiLife adds. If you want a popular, well-reviewed foam cushion with a long warranty, it's a good value. check the current price of the Everlasting Comfort Memory Foam Seat Cushion on Amazon.

The Purple Back Cushion uses the same GelFlex Grid as Purple's seat cushions, in a slim lumbar shape. It measures 15.75 by 9.25 by 2.5 in and weighs 2.5 lb, so it adds support without pushing you far forward in the seat.

An adjustable strap and buckle hold it at the height you choose on most chairs, and the cover comes off for a cold machine wash. Purple says the grid's air channels help it stay temperature neutral. It pairs well with the Purple Double Seat Cushion, and Purple sells the two as a bundle.

At 2.5 in thick, it may not fill a deep gap on a very flat backrest, where the ComfiLife does better. Purple's page lists both a 1-year and a 10-year warranty, so check the terms when you buy. For chairs that need just a little lower-back support, it's a good fit. check the current price of the Purple Back Cushion on Amazon.