Outdoor Cushion Covers: Replacing, Custom Sizing & Fabric Choices

Replace just the patio cushion covers when the foam is still firm, dry and square and only the fabric has faded or split; replace the whole cushion when the core smells musty, has slumped or has gone lumpy. Custom covers in solution-dyed acrylic cost roughly 40–60 percent of new cushions and make a five-year-old set look new.

Outdoor seating fails from the outside in: after three to five seasons the fabric fades on the top face, the thread rots at the seams and the zip sticks, while a decent foam underneath is usually fine. Knowing which part to replace is the whole trick, and the mended, recovered terrace is a theme of our 2027 outdoor living trends.

When to replace just the cover vs the whole cushion

Fading, split seams, a broken zip and stains are cover problems; mildew smell, a slumped or lumpy core and a cushion that stays wet for days are foam problems. Unzip one cushion and check before you order.

The mistake we see most often is recovering compressed foam in expensive fabric because it looks fine dry. Press a thumb into the middle: if it does not spring back within a second or two, or the cushion is thinner in the middle than at the edges, the core is done, and new covers on it will look wrinkled within a month.

Solution-dyed acrylic vs polyester vs olefin

Solution-dyed acrylic is the best all-round fabric for outdoor cushion covers because the color is locked in the fiber and it resists UV, mildew and water; polyester is cheapest and fades fastest; olefin is the value option with strong stain resistance. All three look alike new, so the label is what matters.

• Solution-dyed acrylic, 250–330 gsm (7–10 oz per sq yd): pigment goes into the liquid polymer before spinning, so color runs through the yarn like a carrot rather than a radish. Colorfast for many seasons in full sun, quick-drying, tolerates diluted bleach for mildew, feels like cotton canvas, and typically rates 15,000–30,000 Martindale cycles. The most expensive, at roughly 25–45 USD per yard.
• Solution-dyed olefin (polypropylene), 220–300 gsm: the same pigment-in-fiber principle at 12–25 USD per yard, with excellent stain and chlorine resistance and a more synthetic hand. Slightly less UV stable than acrylic; a good choice for pool furniture and rentals.
• Polyester, 180–260 gsm with a PU water-repellent coating, 8–18 USD per yard: dyed after weaving, so sun bleaches the surface and a two-year-old cover shows a pale top and bright underside. Fine for a covered porch or a set you accept replacing every few years.

Whatever the fabric, insist on UV-resistant bonded polyester or PTFE thread, because the seam fails before the cloth, and ask for the fade warranty in writing.

Mid-tone neutrals and heathered weaves hide sunscreen and pollen better than white or navy, and a light color keeps the seat cooler. Against silvered or oiled teak, sage, oat and ochre are the pairings we recommend in our guide to teak outdoor furniture; charcoal reads sharper with black aluminium frames.

How to measure for a custom-fit replacement cover

Measure the foam core, not the old cover, because the cover has stretched and the foam has compressed; record width, depth and thickness for every cushion, plus tie positions and any arm cut-outs. Custom cushion covers are made to those numbers, and one 1 in (2.5 cm) too big looks like a sack.

1. Remove the foam from one cushion of each type: seat, back, chaise, and any corner or wedge shapes.
2. Measure width across the front edge from side to side, in inches and centimeters, to the nearest 0.25 in (0.5 cm).
3. Measure depth from front to back. For a tapered back cushion, record top and bottom widths.
4. Measure thickness at the edge, not the compressed middle. Standard patio cushion sizes run 2–3 in (5–8 cm) for dining seats, 4–6 in (10–15 cm) for deep-seating sofas and 3–4 in (8–10 cm) for chaise pads.
5. Check the frame: measure the seat frame's inside width and depth; the cushion normally sits 0.5–1 in (1–2.5 cm) inside it.
6. Note the shape: a boxed cushion has six faces and a zip on the back panel; a knife-edge cushion has two faces; a T-shape wraps the arms, so measure the notch width and depth.
7. Mark tie and zip positions on a sketch: ties at the back corners for chairs, back and mid-side for chaises, zip along the rear or underside.
8. Decide the fit. Order to exact foam dimensions for a tight upholstered look; for outdoor cushion slipcovers that slide over an existing cover, add 0.5 in (1.3 cm) each way.

Before ordering, check the numbers against the maker's template and confirm them with their service team; every workroom has its own seam-allowance conventions. Common stock patio cushion sizes for comparison: dining seat 18–20 × 18–20 × 2–3 in (45–50 × 45–50 × 5–8 cm); deep seat 24–26 × 24–28 × 4–6 in (60–66 × 60–70 × 10–15 cm); chaise 72–78 × 22–25 × 3–4 in (183–198 × 56–64 × 8–10 cm).

Zips, piping and closures that hold up outdoors

Specify a non-corroding molded plastic zip, a self-fabric welt and a mesh or grommet vent on the underside; these three details separate a cover that lasts eight seasons from one that fails in two, and they are where cheap covers cut corners.

• Zips: a size 5 or larger molded plastic zip with a non-metal slider does not corrode or seize; metal zips rust and stain, coil zips split under thick foam. Run it the full width of the back panel plus 4 in (10 cm) down each side, under a flap that keeps grit out of the teeth.
• Piping or welt: a self-fabric welt over UV-stable polyethylene cord stiffens the edge and hides the seam. Cotton cord rots and wicks water into the seam.
• Vents: a mesh strip or two or three grommets on the underside let water drain and air move; without them the cover balloons when you sit and traps moisture.
• Ties and fasteners: self-fabric ties at least 12 in (30 cm) long, or hook-and-loop straps on deep-seat backs, with plastic or stainless hardware only.
• Seams: double-stitched with UV-resistant thread at 8–10 stitches per inch, internal edges overlocked.

Foam and quick-dry fill: what's inside matters too

Quick-dry reticulated foam is the right core for any cushion that stays outside, because water runs straight through it and it dries in hours; standard upholstery foam holds water like a sponge and grows mildew from the inside.

• Quick-dry reticulated foam: open-cell polyurethane with the cell membranes removed, so it is 90–97 percent air. Rain drains out through the vent in minutes and the cushion is usable within hours of sun. Firmer and springier than indoor foam; 1.5–2.0 lb density in 4–6 in (10–15 cm) suits sofas. The most expensive, and worth it for uncovered furniture.
• Standard high-resilience foam: comfortable and cheaper, but it absorbs water and can take days to dry. Acceptable only under a roof, and always with an antimicrobial treatment.
• Compressed polyester fiber: the fill in most budget cushions. Soft when new, it compacts and lumps within a season or two and holds water; keep it for scatter cushions.
• Foam with a quick-dry fiber wrap: a 1 in (2.5 cm) batting around a foam core softens the edges and fills the cover corners.

Whatever the fill, a spun-bonded liner between foam and cover lets you slide the cover on without wrestling.

Cleaning and mildew prevention

Mildew needs moisture, warmth and organic food, so keep cushions dry, aired and free of pollen and sunscreen and it never gets established; a rained-on cover left face down for a week is where every mildew problem begins. Check the care label before any of the following.

• Weekly in season: brush off pollen and crumbs, and stand cushions on edge after rain so both faces dry.
• Monthly: hose down, sponge with mild soap, rinse and air-dry fully on edge before putting them back.
• Spot-treat mildew on solution-dyed acrylic with one part household bleach to nine parts water, rinse well and dry; test the underside first. Use an oxygen-based cleaner on polyester instead.
• Never stack wet cushions or shut them in a deck box overnight after rain.
• Machine washing: many acrylic and olefin covers accept a cold, gentle cycle if the label agrees; zip closed, wash separately and air-dry flat. Never tumble dry, which shrinks the cover so it no longer fits the foam.
• Re-treat acrylic covers every year or two with a spray-on water repellent to restore the beading.

Storage for winter or the off-season

Store outdoor cushions clean, completely dry and loosely stacked where air moves; a damp cushion in a sealed bag comes out in spring with black spots and a smell that never leaves.

1. Wash and dry every cushion in the last warm week of the season, and unzip one to confirm the foam is dry through.
2. Use breathable bags of woven polypropylene or cotton, or a vented deck box with a raised floor, never a sealed plastic bin.
3. Store flat or on edge, not folded, no more than four deep, off the floor on a pallet or shelf in a dry garage or shed.
4. Add a moisture absorber such as silica gel or a calcium chloride tub to a deck box and check it midwinter.
5. Bring covers in separately if space is tight, and stack the bare quick-dry foam in the shed.

A quick checklist before you order custom covers

• Foam checked: firm, dry, square, no smell; otherwise budget for quick-dry foam too.
• Fabric: solution-dyed acrylic or olefin at 250 gsm or heavier, UV-resistant thread, fade warranty in writing, swatch in hand.
• Measurements: width, depth and thickness of every cushion type taken from the foam, plus frame and notch dimensions, in inches and centimeters.
• Construction: boxed or knife edge, self-welt on UV-stable cord, molded zip along the back and down the sides, underside vents, ties marked on a sketch.
• Fit and confirmation: exact foam dimensions for a tailored look, plus 0.5 in for slipcovers; numbers checked against the maker's template; lead time of 2–6 weeks noted.
• Quantity: for a rental or hotel, order 10–20 percent spare covers in the same dye lot.

Pick the right fabric and measure the foam once, and the same frames go another five years: the solution-dyed outdoor cushions in Edit 06, The Mediterranean Terrace are sized for standard deep seating, and the cantilever umbrella guide covers the canopy fabric that shades them. Hosts and hotels recovering a whole terrace can request custom covers through the sourcing desk.

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Custom deep-seat cushion cover26 × 26 × 5 in boxed · solution-dyed acrylic 300 gsm · molded zip · underside vent Shop similar:AmazonEtsyWayfairGet it made

Quick-dry reticulated foam core5 in thick · 1.8 lb density · open-cell · spun-bonded liner Shop similar:AmazonEtsyWayfairGet it made

Dining chair seat pad19 × 19 × 2.5 in · olefin heather · 12 in ties · welted edge Shop similar:AmazonEtsyWayfairGet it made

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Frequently asked questions

Can you just replace the cover and keep the old cushion foam?

Yes, if the foam is firm, springs back when pressed, is dry inside and has no musty smell or dark spots. If it has slumped, feels thinner in the middle, stays wet after rain or smells of mildew, replace the core with quick-dry foam at the same time, because a new cover will not hide a tired cushion.

What fabric is best for outdoor cushion covers?

Solution-dyed acrylic at 250–330 gsm is the strongest all-rounder: the pigment is in the fiber, so it resists fading, mildew and water for many seasons. Solution-dyed olefin costs less and resists stains and chlorine, making it a good pool and rental choice. Polyester is cheapest but fades within a few seasons in full sun.

How do you stop outdoor cushions from getting moldy?

Keep them dry and aired. Stand cushions on edge after rain, brush off pollen and food, never stack them wet or shut them in a sealed box, and choose quick-dry reticulated foam with a vented cover so water drains through. Clean solution-dyed acrylic with dilute bleach at the first spots and store cushions bone dry for winter.

How do you measure for custom patio cushion covers?

Take the foam out and measure it, not the old cover: width across the front, depth front to back and thickness at the edge, to the nearest 0.25 in, for each cushion type. Note T-shape notches, tie positions and where the zip should sit, then confirm the numbers against the maker's template before ordering.

Can outdoor cushion covers go in the washing machine?

Some can. Many solution-dyed acrylic and olefin covers tolerate a cold, gentle cycle if the care label allows it; zip them closed and wash separately. Polyester with a coating is usually hand-wash only. Whatever the fabric, air-dry flat or on edge and never tumble dry, which shrinks the cover so it no longer fits the foam.