Trapezium Bench/Sofa Seat Cushions
Customer reviews
The Foamera Custom Trapezium Cushion is a four-sided cushion made to measure for bay-window benches, boat berths, angled banquettes and sofa seats where the front edge is wider or narrower than the back. Every trapezium cushion is made by Foamera. You set the front width, back width, depth and thickness in inches or centimetres, then choose the fill and fabric.
Trapezium Bench/Sofa Seat Cushions
Review & Confirm
- Free ShippingIncluded in your price
- Made to MeasureCut to your exact size
- Inches or cmEnter sizes your way
- WhatsApp SupportAsk before you order
Product details
- Fit guarantee
- 14 days from delivery
- Shape
- Trapezoid
- Use
- Indoor, outdoor
- Returns
- Made-to-measure items cannot be returned for change of mind. Statutory rights for faulty goods are unaffected.
Who is it for?
- Bay-window benches
- Angled banquettes and breakfast nooks
- Boat berths
- Sofa seats and patio corners with angled sides
Description
Trapezoid (trapezium) cushions cut to your exact angled sides — for bay-window benches, boat berths, angled banquettes and sofa seats where the front edge is wider or narrower than the back. We template all four sides from your measurements and hand-cut the foam so every angled edge meets your frame cleanly.
Firm high-density foam gives supportive daily seating that keeps the trapezoid shape, while fiberfill suits softer, decorative pieces. Choose from our indoor and outdoor fabrics and add piping to sharpen the angled edges. Measure the front width, the back width, the depth between them and the thickness — note which edges are angled — and your exact price appears on screen instantly, no quote or upholsterer's wait. Backed by our 14-day perfect-fit guarantee.
How to measure
- Measure and note the front width, back width, depth and thickness you need.
- Enter each size in the Measurements step of the configurator, then choose the fill and the fabric.
- Check every value under Review & Confirm before you add the cushion to your cart.
Sizes can be entered in inches or centimetres on each product page.
Questions and answers
What do I measure for a custom trapezium cushion?
The configurator asks for the front width, back width, depth and thickness. Sizes can be entered in inches or centimetres on each product page. See the guide "How to Measure a Window Seat Cushion".
Which fills can I choose for a custom trapezium cushion?
The configurator offers three fill types: High Density Foam, Fiber Fill and Cover Only. Cover Only is a custom-sewn cover for your own foam or to replace an old cover.
Can I add a matching back cushion to a trapezium cushion?
Yes. The configurator has an optional backrest step with three backrest types: Solid Foam, CNC Ergonomic and Fiber Fill.
Can I return a made-to-measure trapezium cushion if I change my mind?
Made-to-measure items cannot be returned for change of mind. Statutory rights for faulty goods are unaffected. The fit guarantee window is 14 days from delivery.
Same seat. Whole new life.
The seat stays — only the cushion changes.
See customer photos
CARE & LONGEVITY
How to keep them looking new.
A 30-second routine. Twice a year. That's it.
Weekly
Plump, rotate and swap cushion positions.
Twice a year
Deep-clean the covers and air the foam in indirect light.
Off-season
Store dry in a breathable cotton bag, never sealed plastic.
Do’s and don’ts · 12 tips
Do
- Brush or vacuum before any wet cleaning.
- Blot spills immediately with a clean lint-free cloth.
- Test any new cleaner on a hidden seam first.
- Clean the whole panel, seam to seam, to avoid water rings.
- Dry everything completely before storage or reuse.
- Plump, rotate and swap cushion positions weekly.
Don't
- Never machine-dry outdoor or velvet covers.
- No pressure washers — they break down fabric coatings.
- Avoid rubbing in circles — it spreads and sets stains.
- Skip fabric softeners and scented detergents.
- Never leave foam in direct sun for more than a few hours.
- Don't store cushions damp or sealed in plastic.
NEED HELP?
Send us a photo of the spot.
We'll diagnose what it is and the safest way to lift it.