Coccyx cushions: what the U-shaped cutout is actually for

Everything else about it — the contoured top, the firm foam, the tapered front — exists to make that removal hold up over a long sit.

One point, removed

The tailbone sits on the midline, at the very bottom of the spine, and on an ordinary seat it is one of the first things to make contact when you lean back. Padding softens that contact; it does not remove it. A coccyx cushion cuts a U-shaped cutout into the rear edge of the foam — on the Aylio cushion the cutout is a channel that goes clean through to the base — so the tailbone hangs over open air. Your weight moves forward onto the two sit bones and the thighs, the structures built to carry it, and the tailbone carries nothing at all.

That is the entire mechanism. It is also why the shape has no measurement step: the cutout is at the midline, and sit-bone spacing plays no part in whether it lines up.

What the rest of the cushion does

A tailbone-first cushion should support the sit bones fully — the opposite of what the Socket Seat does — so there is no opening under them: the sit bones and thighs land on a full bed of firm foam, which is where the weight the cutout displaces ends up. The top is contoured around that: a raised ridge down the center keeps the thighs apart, and the front edge tapers so it does not dig into the back of the legs. The base is non-slip, so the cushion stays where you put it on leather, mesh, or vinyl.

If the two sit bones themselves are the sore points, this is the wrong tool — a full bed of foam under them is exactly what you do not want. That case belongs to the twin-cutout geometry, and tailbone pain vs sit-bone pain walks through telling the two apart.

U-notch vs donut vs twin openings

Three shapes share the phrase “cushion with a hole,” and they remove the seat from three different places.

The two Aylio cushions are the first and third rows, and the direct comparison is the decision rule between them.

Firm on purpose

Low-density memory foam feels wonderful at first; under daily use it flattens and stays flat. The Aylio coccyx cushion uses molded high-resilience foam instead — firm enough that the channel stays open under your weight, and springy enough to rebound every time you stand. Firm is a feature here for the same reason it is on the Socket Seat: a cutout only works while the foam around it holds its shape. Why firm beats soft covers the mechanism.

The cover is soft velvet and washable. The cushion measures about 18″ wide, 14″ deep and 2.5″ thick, and weighs about a pound — light enough to move between an office chair, most car seats, a dining chair, bleachers or a wheelchair.

What is the best cushion for a sore tailbone?

One whose cutout sits under the tailbone and whose foam does not collapse into it: a U-notch open at the rear, in foam firm enough to keep the notch open through a long sit. Padding under a sore coccyx softens the contact; only an opening removes it. Sit-bone width is irrelevant to this shape, so there is nothing to measure — the questions are whether your pain is really at the midline (below) and whether your seat is flat.

What is an orthopedic coccyx pillow?

A seat cushion with a rear cutout that suspends the coccyx over open space. “Orthopedic” on a listing is a marketing word, not a standard; what matters is the shape (a U-notch open at the back), the foam (firm enough to hold the notch open) and the fit to your seat. Ours is molded high-resilience foam, 18″ × 14″ × 2.5″, with a washable cover.

One spot or two?

Sit down and point at the pain. One spot on the midline, at the base of the spine, is what this shape is for. Two spots, left and right of center, belong to the twin-cutout geometry instead — and if you are not sure which of the two Aylio shapes you need, the direct comparison is the decision rule; the Socket Seat also needs the 60-second fit check first.