PostureArc™
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That's how confident we are in your results. But if you're not thrilled, send it back and we'll refund your purchase.
Most seat cushions fix the seat. That's half the chair.
When you sit, your weight funnels onto two bony points and the small of your back loses contact with the chair entirely. A seat-only cushion solves the first problem and leaves the second wide open.
PostureArc™ is one continuous curve, tailbone to lower back. The contoured seat spreads your weight across the whole thigh and buttock. A U-shaped channel lifts your coccyx clear of the seat — not padded, removed. The curved lumbar panel meets your lower back exactly where the chair gave up.
Both halves are high-density viscoelastic memory foam: it takes your shape under body heat, then recovers when you stand. Density is why it doesn't flatten by lunch.
The lumbar half matters more than people expect. Sitting upright loads the lumbar discs at 1.24–1.45× standing. Sitting with lumbar support at 110° measures 0.80 — below standing. The load isn't created by sitting. It's created by sitting with nothing behind the curve.
- Air it for 48 hours before use. New foam has a mild odour that ventilation clears. Don't leave it in a hot car that first week.
- Firm, flat seats only. Office chairs, car seats, dining chairs, wheelchairs. Not beds or deep sofas — it needs something solid to work against.
- Seat cushion: wide edge forward, U-shaped channel at the back, under your tailbone.
- Lumbar support: against the chair back, deepest part of the curve just above your belt line.
- Sit all the way back. Both halves need your pelvis against the backrest to do anything.
- In the car: expect to lower your seat. It adds real height.
- To wash: unzip both zips, slide the cover off, machine wash cold and air dry. Never wash the foam.
- One continuous curve. Seat and lumbar as a single arc — no gap between cushion and chair back.
- U-shaped coccyx channel. Takes the tailbone out of the load path instead of padding it.
- High-density memory foam. Takes your shape, then recovers. Density is what stops it flattening.
- Contoured lumbar panel with raised massage nodes.
- Two-zip cover. Outer seam and centre channel, so it comes fully off the core for washing.
- Textured non-slip base. Holds position on office chairs and car seats.
PostureArc™
Rated 4.8/5 based on +10,839 Total Ratings
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Find answers to common questions about our products, shipping, returns, and more.
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Standard shipping typically takes 3-5 business days within the continental US. International shipping times vary by location.
We offer a 30-day return policy. If you're not satisfied with your purchase, you can return it within 30 days for a full refund or exchange.