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A bolster straight back cushion cover is a four-measurement pattern, and that fourth number is what stores can't sell you. Length and height are easy; the taper — a bottom width and a smaller top width — is what makes the cushion stand up straight against the frame instead of flopping. Enter all four and the cover comes back matching the cushion's real profile — straight back, sloped front, flat top.
These back cushions do quiet, constant work: the backrest line on a daybed, the support run along a bench, the padded rail across a swing. They face the sun square-on all afternoon — the exact exposure that bleaches cheap fabric fastest. Solution-dyed Sunbrella holds its color there, because the pigment lives in the fiber rather than on the surface.
And when the old fabric finally gives out, a replacement bolster straight back cushion cover costs a fraction of new cushions. The shaped foam inside is almost always still good. Re-cover it and the whole daybed line looks new again.
Re-covering the seat cushions at the same time? Explore every shape in the outdoor cushion covers collection and match the whole set.
Why Choose Our Custom Bolster Straight Back Cushion Covers?
Four Numbers, One Upright Fit
Length, height, bottom width, top width — the full recipe for a straight back. With all four honored, the cushion stands square against the frame, leans right, and never slumps forward off the seat.
A Taper That Keeps Its Posture
The base is the cushion's widest point for a reason: that's where the lean loads it. Profile panels cut to both widths keep the wide-at-bottom stance that holds the cushion upright year after year.
A Straight Back and an Honest Lean
The rear panel is cut dead vertical to sit flush against the frame, while the sloped front face carries the recline. Two different jobs, two different panels — and a backrest that feels engineered, not stuffed.
Facing the Sun All Day, Every Day
An upright back cushion presents its full face to the afternoon sun. UV-stable, fiber-locked color takes that head-on exposure, and Horizon adds full waterproofing for frames that live uncovered.
Hardware Where Nobody Sits or Sees
The bottom-edge zipper hides between cushion and seat — no metal against shoulders, nothing visible from the patio, and the coil stays shaded from the weather that ages exposed hardware.
Step-by-Step Measuring Guide
• Slide the foam out of the old cover and stand it the way it sits on the furniture.
• Measure the length end to end along the base.
• Measure the height up the straight back panel, base to top.
• Measure the bottom width — the cushion's thickness at its base.
• Measure the top width across the flat top, then read all four numbers back before ordering.
The name describes the geometry: a back cushion whose rear face is perfectly straight — a vertical panel that sits flush against the daybed or bench frame — while the front face slopes outward toward the base, giving your back a built-in recline. The top is flat and narrower than the bottom, and the difference between top width and bottom width is exactly what sets that lean angle. We cut the two end profiles as a matched pair from your four numbers, so the angle you measured is the angle you get.
Exposure picks the fabric. Sunbrella Horizon, a marine-grade vinyl, suits back cushions on uncovered daybeds and swings: fully waterproof, wiped clean in seconds, flexible enough to follow the rounded top without stress lines. Sunbrella Canvas — solution-dyed acrylic, water-repellent and breathable — is the softer choice against shoulders on covered porches. Both carry Sunbrella's 5-year limited fabric warranty.
The YKK zipper runs along the bottom edge, where the cushion sits against the seat — invisible in use, shielded from sun and rain by the cushion's own footprint, and corrosion-resistant besides.
• A straight-backed support wedge — vertical at the rear, angled lean at the front, sewn to your four numbers
• Length, height, bottom width, and top width all cut to the quarter inch
• Flat top narrower than the base — the taper that gives the lean its angle
• Waterproof Sunbrella Horizon vinyl or soft-woven Sunbrella Canvas
• Backs daybeds, benches, swings, and cylindrical outdoor loungers
• YKK zipper tucked along the bottom edge, hidden where cushion meets seat
• 5-year limited fabric warranty, both fabric lines
