Olefin, Acrylic or Polyester? Outdoor Fabrics in an Honest Comparison
Three fibres dominate the outdoor textiles market – and the differences determine whether your cushion is faded and mouldy after two summers, or still looks like new after years. We've been making outdoor cushions since 2020 and deliberately chose one of these three fabrics right from the start. In this comparison you'll find out how olefin, acrylic and polyester really perform – including the points where even our favourite isn't the best.
The quick comparison: three fibres, eight criteria
| Olefin (polypropylene) | Acrylic (solution-dyed) | Polyester | |
|---|---|---|---|
| Water absorption | Almost zero – the fibre is naturally hydrophobic | Low, but relies on impregnation | Significantly higher, dries slowly |
| Mould resistance | Very high | Medium – dirt on the fibre can encourage mould | Low under constant moisture |
| UV / colour stability | High (colour in the fibre + UV stabilisers) | Very high – the benchmark | Low – visibly fades |
| Chlorine / salt water | Insensitive | Largely insensitive | More sensitive |
| Feel | Soft, textile-like | Very soft, high-end | Varies widely, often "plasticky" |
| Maintenance effort | Low – wiping down is enough | Medium – impregnation needs regular renewal | Low, but shorter lifespan |
| Price level | Medium | High | Low |
| Typical use | Outdoor cushions, upholstery | Awnings, sun sails, premium upholstery | Cheap DIY-store cushions |
So much for the table. Now let's look behind the numbers – because each of the three fibres has a character that only really shows up in everyday use.
Olefin: the specialist for everything that gets wet
Olefin (chemically: polypropylene) has a property no other textile fibre offers in this form: the fibre itself absorbs practically no water at all. Not "little" – practically none. What that means in everyday life: rain beads off, the cushion dries in minutes instead of days, and mould simply finds no damp breeding ground.
The second trump card: olefin is solution-dyed. The colour is blended into the fibre before spinning – it's in the material, not on it. A solution-dyed fabric can't "flake off" or wash out the way a printed one can. Combined with modern UV stabilisers, the colour stays rich for years.
Where olefin doesn't shine – honestly
- More heat-sensitive than acrylic: a forgotten pair of grill tongs or a cigarette leaves marks faster
- For pure long-term UV stability, high-quality acrylic remains the benchmark – olefin comes close, but doesn't overtake it
- The reputation: cheap olefin from the Far East has given the fibre an image problem. The quality difference between weaves is significant
It's exactly this combination of properties that led us to choose 100% olefin at Lulu-Belle in 2020: our cushions live outdoors – on patios, by pools, in gardens. There, moisture is enemy number one, not constant awning-style sun exposure. For the use case "a cushion that gets wet and needs to dry quickly again", olefin is the most logical fibre. More on our three olefin quality tiers can be found on our fabric page.
Acrylic: the aristocrat among outdoor fabrics
Solution-dyed acrylic – known through brand names like Sunbrella – has been the standard for awnings and boat covers for decades. And rightly so: for UV stability and colour depth, acrylic is the benchmark all others are measured against. The feel is wonderfully soft, almost like cotton.
Strengths
- Best UV and colour stability on the market – the fibre was developed for exactly this
- Very high-quality, soft feel
- Proven over decades in constant use on facades and boats
Weaknesses – honestly
- Acrylic isn't naturally water-repellent – it needs an impregnation that wears off and has to be renewed regularly
- Once the impregnation fades, moisture gets drawn into dirt particles on the fibre – and then even acrylic can develop mould
- Clearly the most expensive of the three options
In short: for an awning that's always stretched out in the sun and rarely subjected to moisture, acrylic is the first choice. For a cushion that has wet swimsuits sitting on it, the calculation shifts – there, how it handles water matters more than the last percentage point of UV stability.
Polyester: the budget option with an expiry date
Polyester is the fibre of cheap DIY-store cushions – and the reason many people believe outdoor cushions have to be replaced every two years. The problem isn't polyester itself, but how it's used in cheap products: piece-dyed (colour only on the surface) instead of solution-dyed, without meaningful UV stabilisation, with a thin coating that cracks after one season.
Strengths
- Cheap – the lowest entry price
- Tear-resistant and dimensionally stable when new
- Often sufficient for furniture that's only outdoors a few weeks a year
Weaknesses – honestly
- Visibly fades under UV radiation – often patchy and pale after just one season
- Absorbs moisture and dries slowly – ideal conditions for mildew and mould
- Coated variants are waterproof but not breathable: moisture then condenses in the foam underneath
The last point is deceptive: "waterproof" sounds like an advantage, but with cushions it often has the opposite effect – moisture that gets in from below or through the seams can no longer get out. A breathable, fast-drying fabric beats a plastic shell almost every time.
Which fabric for which use? The decision matrix
| Your use case | Best choice | Why |
|---|---|---|
| Cushions that stay outdoors permanently | Olefin | Dries fastest, doesn't develop mould |
| Pool area (chlorine, wet swimwear) | Olefin | Chlorine-insensitive, hydrophobic |
| Awning, sun sail | Acrylic | Maximum UV stability, rarely exposed to moisture |
| Premium look with the highest budget | Acrylic (with disciplined care) | Softest feel – factor in impregnation |
| Furniture that's only outdoors on holiday | Polyester | Affordable, sufficient for short-term use |
| Balcony with no storage (everything stays outside) | Olefin | Handles rain without needing to be brought in |
If you're currently planning cushions: which foam thickness goes under the fabric is explained in the guide What foam thickness for outdoor cushions? – and for pool areas there's the dedicated guide Pool cushions: waterproof and chlorine-resistant.
The simplest practical test: the water-drop test
You don't need a textile lab to compare outdoor fabrics. A glass of water is enough: drop some onto the fabric and see what happens. On good olefin, the drops sit like little beads and roll off. On freshly impregnated acrylic, the same happens – on worn acrylic they slowly soak in. On uncoated polyester they disappear into the weave.
That's exactly why we send out free fabric samples: so you can test our three olefin qualities (Standard, Premium, Premium ZigZag) at home yourself – with water drops, in the sunlight of your own patio, next to your own furniture. For a complete overview of all cushion types, see the guide Custom outdoor cushions.
Quick questions, quick answers
Is olefin the same as polypropylene?
Yes – olefin is the textile trade name for fibres made from polypropylene (PP). Both terms appear in product descriptions and refer to the same material. All the details on the fibre are answered in the guide What is olefin?.
Which outdoor fabric lasts longest?
It depends on the use: in constant sun without moisture exposure, high-quality acrylic lasts longest. For cushions that regularly get wet, olefin wins – because there, it's moisture and mould, not UV, that determine the lifespan.
Why do DIY-store cushions fade so quickly?
Usually piece-dyed polyester: the colour sits only on the surface of the fibre and is broken down by UV radiation. Solution-dyed fibres (olefin, branded acrylic) carry the colour within the material – they can't fade in the same way.
Do I need to impregnate olefin?
No – that's the key difference from acrylic. The water repellence comes from the fibre itself and doesn't wear off. Wiping with a damp cloth is enough as care; details in the care guide.
Which fabric does Lulu-Belle use?
100% olefin in three quality tiers (Standard, Premium, Premium ZigZag) – for all cushions, upholstery and the outdoor beanbag. The decision was made deliberately in 2020 in favour of olefin, because our products are made for life outdoors, where fast drying matters more than the last percentage point of awning-grade UV stability.
The conclusion in three sentences
Polyester is the budget choice for occasional use, but loses colour and shape in constant use. Acrylic is the UV champion for awnings and anything stretched out in the sun – but needs impregnation maintenance. Olefin is the specialist for cushions and upholstery that live outdoors: naturally water-repellent, mould-resistant, colourfast and with no maintenance subscription required.
Sarah Engleman
Product Development at Lulu-Belle. Since 2020 we've been developing made-to-measure outdoor cushions and furniture, hand-sewn in our workshop in Hungary – with over 730 customer reviews speaking for themselves.
