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September is when the sweaters come out of the wardrobe, and when SHEIN’s knitwear section fills with chunky cardigans, cable knits and cropped pullovers at prices that make a whole autumn wardrobe affordable. The photos are always flattering. What they can’t show is how the sweater will look after the fifth wear.
That depends almost entirely on one line of the listing: the fibre content. This guide explains how to read it and what to do about the thing that will most likely happen to a cheap sweater, which is pilling.
Quick answer: Check the composition line first. SHEIN knitwear is usually acrylic, polyester or nylon, often in blends such as 42% acrylic, 30% polyester and 28% polyamide, and acrylic-heavy sweaters pill easily. A common rule of thumb is that a sweater more than about 30% acrylic or polyester will pill and keep its pills. Cotton and viscose blends pill less but stretch more. Wash inside out on a gentle cycle, dry flat, and expect to use a fabric shaver once or twice a season.
Why sweaters pill
Pilling is the little balls of fibre that form where fabric rubs: under the arms, at the cuffs, across the bag strap area. It happens when loose fibre ends work their way to the surface and tangle. Synthetic fibres are strong, so once a pill forms it doesn’t break off the way it would on wool; it hangs on. That’s why a 100% acrylic sweater can look fine on day one and shabby after a handful of outings.
Acrylic isn’t the villain of the piece. It’s soft, warm, light and cheap, and some low-pill variants exist. But on a budget knit with a loose, fuzzy yarn, you should assume it will pill, and decide whether you’re happy with that for the price.
Reading the composition line
| On the label | What to expect | Verdict |
|---|---|---|
| 100% acrylic | Soft and light, warm for the weight; pills readily | Fine for one season |
| Acrylic + polyester + polyamide | Common SHEIN blend; hardwearing but pills and holds the pills | Use a shaver |
| Cotton or viscose blend | Pills less, but stretches and loses shape when washed | Dry flat |
| Anything with real wool | Rare at these prices; check the percentage, not the word “wool” | Worth the extra |
SHEIN listings generally show composition and care instructions under Product Details, and typical care advice for knits is hand wash or professional clean. It rarely lists a wool-heavy sweater at these prices. If you want actual wool, look at the percentage, not the word “wool-look” or “knit”. See my SHEIN quality guide for how to read a composition line properly, and the SHEIN safety, payment and data for what regulators have said about chemical finishes.
How to pick a better one from the listing
- Prefer a tight, smooth knit to a fuzzy, brushed one. Fuzzy yarns shed and pill fastest.
- Sort reviews by lowest rating. Pilling complaints show up quickly in recent photos, usually after the first washes.
- Check the stretch field and the review photos for thickness. A thin sweater with high stretch will lose shape; a medium-weight, slight-stretch one holds up.
- Size honestly. Oversized knits are cut generously and don’t need a bigger size. Fitted ribbed knits often do. My SHEIN sizing guide explains why charts differ by listing.
Washing and drying cheap knits
This is where you get the most life out of a budget sweater, and nothing here is exotic. Wash it as the care label says, and if there’s no clear instruction, use these defaults:
- Turn it inside out to reduce surface friction.
- Use a gentle or wool cycle with cold water, or hand wash.
- Don’t tumble dry. Heat and tumbling are what make synthetic knits bobble and shrink.
- Lay flat on a towel, as below, instead of hanging, which stretches the shoulders.
For pills that appear anyway, a handheld fabric shaver does the job in a couple of minutes per sweater. Cutting pills off with scissors is a good way to make a hole.
Returns before the first wash
Sweaters can go back within 30 days of delivery as long as they’re unworn, unwashed and still have their tags. That makes the arrival test important: check the fibre line against the listing, feel for scratchiness at the neck, and hold the fabric to the light to check for thin patches. If you don’t like it, send it back before you wear it. The first return from an order is free; the SHEIN returns policy has the details, including the fee for later returns from the same order.
Frequently asked questions
Do SHEIN sweaters pill?
Many do, especially acrylic and polyester knits with a fuzzy yarn. Pilling usually appears at the underarms and cuffs within the first few wears. A fabric shaver and gentle washing keep it under control.
What are SHEIN sweaters made of?
Most are acrylic, polyester, nylon, cotton or blends of those. Typical listings show compositions such as 100% acrylic or 42% acrylic, 30% polyester and 28% polyamide. Real wool at a significant percentage is rare at these prices.
How do I wash a SHEIN sweater?
Follow the care field on the listing. Without one, wash inside out on a cold, gentle cycle or by hand, don't tumble dry, and dry flat on a towel.
Are SHEIN sweaters warm?
Acrylic is warm for its weight, and thicker knits are noticeably warmer than thin ones. Look at recent review photos for how thick it is. A thin knit won't keep you warm on its own.
Can I return a sweater after trying it on?
Yes, if it's unworn, unwashed and has its tags, within 30 days of delivery. The first return from an order is free.
The short version
A SHEIN sweater is a fine seasonal buy if you accept that synthetic fibre means pilling. Read the composition line, prefer a smooth, tight knit, wash gently and dry flat, and own a fabric shaver. Test on arrival, before washing, so you can still send back the ones that disappoint. You can look through the current range on SHEIN.
Sources: SHEIN product listings (typical composition and care fields for knitwear); SHEIN US Return Policy; fibre background from Wikipedia’s entry on acrylic fibre and consumer knitwear guides on pilling and fibre content; shopper reviews of SHEIN sweaters on Lemon8. The 30% figure is a general rule of thumb, not a SHEIN specification. Read in late September 2026.