Seat cushions with cutouts: what the holes are actually for

Three different designs share the name. Each takes pressure off a different part of you, and whether any of them fits you depends on a measurement you have probably never taken.

“Cushion with a hole” covers three different shapes

Most people searching for a seat cushion with a hole in it arrive with a pain and a mental picture, not a product name. The designs that answer that search are not interchangeable. The least known of the three is the shape with two holes, one under each sit bone.

The last two get confused constantly, because both register as “it hurts when I sit.” The tailbone is the single midline point at the base of the spine; the sit bones are the two knobs of the pelvis you rock onto when you sit upright on a hard bench.

What a cutout removes, and what padding only redistributes

Every solid material under a load point compresses until it pushes back with a force equal to the load. That includes soft foam, gel, and everything sold as pressure relief. Softness changes how the pressure arrives, not whether it arrives: a plush layer deforms around the bone, hands some load to nearby tissue, then finishes compressing and returns the rest to the exact point it was supposed to protect.

Open space is the exception. Nothing over a cutout pushes back, because nothing is there. That is the entire argument for holes in cushions: padding redistributes pressure, and a cutout removes it. Whether removal is what your particular pain needs is a separate question — our article on ischial bursitis looks at one such diagnosis, and at where a cushion’s job ends and a clinician’s begins.

Placement matters more than hole size

An opening whose rim lands under your sit bone is worse than no opening at all: that bone’s full share of your weight bears down on a narrow band of foam edge instead of spreading across a flat surface. Peak pressure goes up, not down.

Hole diameter gets the attention on product listings because it is easy to photograph. Placement gets none, because stating it invites the follow-up: relative to what? Your sit bones sit at a fixed spacing, the openings sit at a fixed spacing, and the design works only if the two line up. Our fit check answers that before you spend anything.

Testimonials are individual customers’ accounts; your experience may differ.

The spacing problem

Adult sit-bone spacing runs roughly 4 to 6 inches center to center. That range is wide, and it does not track with how big you look in clothes; it tracks with pelvis structure. Any cushion with fixed openings is placing a bet on your skeleton, and no fixed geometry can win that bet for every adult.

Ours is no exception. The Socket Seat’s openings sit 6″ apart center to center, each opening measures 3.5″ across, and 2.5″ of foam runs between them. That geometry, protected by US Patent 9,723,928 among Aylio’s ten issued patents, puts sit bones across most of the adult range in open space while the rear groove keeps the tailbone clear. It does not fit everyone:

• Sit bones outside the designed range of 3.6″ to 6.7″. That range is wider on both sides than most adults measure, so very few people fall outside it — but some do, at either end, and nothing about build predicts who. Under 3.3″ or over 7.0″ the cushion will not work as intended for you and you should not buy it; between 3.3″ and 3.6″, or between 6.7″ and 7.0″, you are borderline, and that is what the 100-day trial is for.
• Adults outside roughly 110 to 295 lbs. The foam’s firmness is tuned for that range. Lighter, and you perch on the surface without settling into the contours; heavier, and the foam compresses past its working depth.
• Tailbone-first pain. If the tailbone is your primary complaint, the groove alone is not enough — a dedicated coccyx cushion is the better tool.

What the cutout costs you

Openings are not free, and most listings skip this part.

First, less continuous surface. The load the openings shed does not vanish; it moves to your thighs and glutes. Those tissues carry pressure well, but only if the foam under them holds its shape, which is why the Socket Seat uses firm high-density foam rather than the plush top layer most buyers expect. Soft foam on a cutout cushion defeats the design: you sink until your sit bones reach rim level and the offloading disappears.

Second, an adjustment period. The first sessions feel firmer than whatever you sit on now; plan on regular use before firm starts to feel normal. The mechanics of why firm support outperforms soft padding across a full workday are laid out in why firm beats soft.

Third, height. Foam that holds its shape under load is 2.5 inches tall, which raises your sitting height on every chair you use it on; more on that below.

The Socket Seat holds 4.3 stars across 4,500+ Amazon ratings. What a rating cannot tell you is whether the openings land under your own sit bones — and that is the half you can settle in a minute, before you order.

If the spacing matches, the worst case is a free return

$99.99 on Amazon with Prime shipping and monthly payments for eligible orders at checkout. Measure first; the firm first days fall well inside the 100-day trial, and free returns cover a change of mind.

See it on Amazon (opens in a new tab)

Measure yourself in 60 seconds

Sit still on a hard, flat surface with a sheet of corrugated cardboard under you for about 30 seconds, leaning slightly forward. Stand up and measure between the centers of the two dents your sit bones left. Compare that number with the 3.6″ to 6.7″ designed range above, and you know whether a twin-opening cushion can work for you before spending anything.

The fit check walks you through this on screen and tells you what your number means. For photos and troubleshooting, see how to measure your sit-bone width.

Cutouts vs gel vs memory foam

Gel and soft memory foam are redistribution strategies; a cutout is a removal strategy. Gel flows away from a load point and spreads pressure sideways, which works until the gel warms and thins under the bone. Plush memory foam deforms slowly around your anatomy, feels custom-fitted for the first hour, then finishes compressing and returns pressure to the points it was shielding. Neither can take peak pressure under a bone to zero; open space can, at the cost of a firmer feel everywhere else. For what that pressure does at the sit bones specifically, see sit-bone pain when sitting.

Will it fit your chair?

The Socket Seat measures 18.5 inches wide, 14.5 inches deep, and 2.5 inches tall. Four checks before you order:

• Seat-pan width. Typical office seat pans run around 19 to 20 inches across, so the cushion sits flat. Dining chairs vary far more — plenty run narrower than 18.5 inches — so measure the seat itself before ordering. On anything narrower it overhangs the edges and can tip if you sit down off-center.
• Seat-pan depth. At 14.5 inches, the cushion leaves the front few inches of a typical pan uncovered. That is intentional: the cushion’s front edge should end behind your knees, not press into them.
• Bucket seats. Sculpted car seats with tall side bolsters can rock a flat-bottomed cushion. The vegan-leather non-slip base grips flat and lightly contoured pans well, but on a deeply bolstered sport seat the cushion rides up on the bolsters and tilts, and a tilted cushion has lost the geometry it exists for. Measure the flat width of the pan between the bolster creases before you order, not after.
• Headroom. About 2 inches of added height raises your head and eye line, and in a low-roof car it may change your mirror and seat adjustments. If your hair already brushes the roof of the car, this cushion is the wrong buy for that car.

It ships with a carry handle and a washable zip cover because many owners end up moving one cushion between a desk chair and a car.