A natural fiber sweater is knit from fibers that grow on an animal or a plant: cashmere, merino, wool, cotton, alpaca or yak. The label proves it. Every fiber has to be listed by percentage, and anything plastic, like acrylic or polyester, shows up there too.
US searches for "natural fiber sweater" this fall are more than six times what they were a year ago, according to Google Trends. Most of the sweater aisle is still acrylic, as we found in The Knitwear Report. So we read labels until we had eighteen women's sweaters at $150 or less, grouped by fiber, cheapest first.
| Cashmere | Merino & wool | Cotton | Yak | |
|---|---|---|---|---|
| Comes from | Goat undercoat | Sheep | Cotton plant | Yak undercoat |
| Price in this guide | $50 to $129 | $55 to $150 | $42 to $98 | $59.90 to $69.90 |
| Toxome Score here | 90 to 91 | 76 to 90 | 92 | 90 |
| Weight | Light and warm | Light to heavy | Lightest, for layering | Warm, a little coarser |
| What to check | "Cashmere blend" with no percentage | Superwash | Acrylic or polyester blended in | Nylon blended in |
Scores from Toxome's fiber scale. Plain wool scores 76 until a brand states it isn't superwash. Prices and stock checked on each brand's site November 13, 2026.
How to check a natural fiber sweater's tag
Read the fiber line, then the care line. The name on the hangtag can say "cashmere" or "wool" and still describe a blend. The Wool Products Labeling Act and the Textile Act require every fiber and its percentage on the label, so the answer is always there.
Acrylic and polyester blends
Acrylic is the most common plastic in knitwear because it's cheap and looks like wool. A "wool-blend" sweater can be mostly acrylic, polyester or nylon. Last week our Abercrombie review found women's "Merino Wool-Blend" sweaters that were 30% wool and 66% nylon.
"Cashmere blend" percentages
"Cashmere blend" has no minimum. It can mean 10% cashmere and 90% something else. Look for the number. Cashmere blended with wool or silk is still all natural fiber. Cashmere blended with nylon or viscose isn't.
Superwash on wool
Superwash is the treatment that lets wool go in a washing machine. The fibers are stripped in a chlorine bath and coated in a thin polyamide resin, a type of plastic, and the label can still read 100% wool. "Machine washable" on a wool sweater usually means superwash. Hand-wash or dry-clean wool usually doesn't.
Small elastane in ribbing
Some sweaters add a little elastane or nylon to the cuffs and hem so they hold their shape. A few percent in the ribbing is a small part of the sweater, but it's still synthetic, and it should be listed. None of the eighteen below has any.
Cashmere
Six sweaters, all cashmere or cashmere and silk. Three are Quince, which sells a 100% cashmere crewneck for $50.
1. Mongolian Cashmere Crewneck Sweater
Quince
100% Grade-A Mongolian cashmere · $50
The least expensive sweater here. A fine 12-gauge crewneck that Quince lists at 15.8 to 16.2 microns, with ribbed cuffs and hem. Hand wash cold, per the care label. Made in China and Cambodia.
2. The Original Cashmere Sweater
Naadam
100% cashmere · $98
A relaxed crewneck in eight colors, with camel, cement, white and navy in stock in every size from XXS to XXL when we checked.
3. Basic V-Neck Cashmere Sweater
State Cashmere
100% Inner Mongolian cashmere · $100
The V-neck in this list. The undyed white and undyed natural colors skip dye entirely. Sizes are patchy by color, so check yours before you fall for one.
4. Mongolian Cashmere Fisherman Turtleneck Sweater
Quince
100% Grade-A Mongolian cashmere · $119.90
A chunky 7-gauge turtleneck in an all-over fisherman rib. It's the warmest cashmere here and still under $120. Made in China.
5. Crewneck Button-Down Cashmere Cardigan
State Cashmere
100% Inner Mongolian cashmere · $120
A crewneck cardigan in the same cashmere as the V-neck. Pale charcoal had the most sizes in stock when we checked.
6. V-Neck Relaxed Silk-Cashmere Sweater
Meilleur Moment
74.7% cashmere, 25.3% mulberry silk · $129
Not 100% cashmere, and the label says so. The rest is mulberry silk, another animal fiber, so there's nothing synthetic in it. Dry clean only.
Merino & wool
Merino is a fine wool from merino sheep. Two of these are 100% merino, one is 100% wool, and two blend wool with cashmere. If you're deciding between merino and cashmere, our cashmere vs. merino guide compares them.
7. Amagansett Cashmere Blend Cardigan
St. George
90% wool, 10% cashmere · Made in Italy · $55
A cropped crewneck cardigan, made in Italy, in brown, navy, grey or cream. It comes in one size, S/M. Plain wool scores 76 on our scale until a brand says it isn't superwash.
8. Australian Merino Wool Cropped Mock Neck Sweater
Quince
100% Australian merino wool · $72
A cropped 5-gauge mock neck in 19.5-micron merino, the weight of a proper winter sweater. Made in Shanghai, China.
9. Everyday Cardigan
Oddli
90% wool, 10% cashmere · $105
A lightweight, fitted crew cardigan. Cream and brown were in stock from XS to XL when we checked.
10. Elizabeth Bow Knitted Jacket
Boden
100% RWS certified wool · $139
A collared knit jacket with gold buttons, contrast-trim pockets and a bow that comes off. It wears like a cardigan. Sizes 4 to 22.
11. Merino Wool Buttoned Cardigan
INSIS
100% merino wool · $150
Right at the cap. A high-neck cardigan with a gathered waist, in raw umber, off white or black ash.
Cotton & linen
Cotton knits are lighter than most wool and don't need a coating to go in the wash. All five here are organic cotton, and all score 92. We didn't find a linen sweater under $150 in stock in a neutral color this week.
12. 100% Organic Cotton Fisherman Crew Sweater
Quince
100% organic cotton · $42
A fisherman-rib crewneck. Quince lists its OEKO-TEX Standard 100 certificate number, SHYO 048142, on the page. Made in China and Cambodia.
13. True Knit Sweater
Organic Basics
100% organic cotton · $66.40 (final sale)
A relaxed crewneck in almond, marked down from $83 when we checked. Final sale, so check the size chart first.
14. Organic Slant Cardi
LA RELAXED
100% organic cotton · $76
A baby-rib cardigan with a slanted front and river shell buttons. It's garment washed, so it shouldn't shrink much more at home.
15. The Cardigan
Cou Cou Intimates
100% organic cotton pointelle · $90
A fitted pointelle cardigan, the lightest knit here. Black was in stock in most sizes from XXS to XXL.
16. The Boxy Sweater
Everlane
100% organic cotton · $98
A boxy crewneck in a chunky rib with dropped shoulders. Navy was in stock in every size.
Alpaca, yak & mohair
Read these labels slowly. Quince's Lightweight Baby Alpaca sweaters are 60% baby alpaca, 35% polyamide and 5% wool, so we left them out. Its two yak sweaters are 100% yak. We didn't find a 100% alpaca or mohair sweater under $150 this week.
17. 100% Yak Soft Rib Crew Cardigan
Quince
100% Tibetan yak wool · $59.90
A seam-free rib cardigan with shell buttons. Quince lists the fiber at 19.5 to 20.5 microns. Made in Shanghai, China.
18. 100% Yak Wool Diamond Stitch Crew
Quince
100% Tibetan yak wool · $69.90
A chunky 5-gauge crewneck with a diamond stitch. Same fiber as the cardigan, made in Cambodia.
Looking for a zip neck instead? Our women's quarter-zip sweaters are all cashmere, merino, cotton or wool. And for the layer over it, four of the nine women's wool coats we read are 100% wool.
A sweater under $150 can be all natural fiber. The label is where it says so.
Frequently asked
For warmth, cashmere, merino and yak. All three score 90 on Toxome when the label is 100%. For a lighter knit, organic cotton scores 92. Which is best depends on how cold it gets and how you want to wash it. Our cashmere vs. merino guide compares the two.
Toxome's shop only lists clothing we've scored from the label. For sweaters under $150, Quince, Naadam, State Cashmere, Everlane and Organic Basics all sell pieces that are 100% one natural fiber. Read the label on each piece, since most brands also sell blends.
They breathe, they hold moisture, and none of them is plastic. Natural doesn't mean untreated, though. Wool can be superwash coated, and cotton can carry dyes and finishes. A certification like OEKO-TEX Standard 100 tests the finished fabric for harmful substances.
Most do, especially soft, fine fibers like cashmere and alpaca. Pills form when short fibers work loose with friction. Quince notes its alpaca may shed and pill with first wear. A sweater comb takes them off. Synthetic blends pill too.
For 100% cashmere under $150, we picked Quince ($50 to $119.90), Naadam ($98) and State Cashmere ($100 to $120). All score 90 on Toxome. Meilleur Moment blends cashmere with silk for $129, with nothing synthetic in it.
The six cashmere sweaters in this guide cost $50 to $129. Price tracks the yarn and the knit. A fine 12-gauge crewneck takes less yarn than a chunky 7-gauge turtleneck, which is why Quince's crewneck is $50 and its fisherman turtleneck is $119.90.
Quince sells a 100% Grade-A Mongolian cashmere crewneck for $50, the lowest price we found from a brand that lists its fiber specs. Naadam's Original is $98. Check that the label says 100% cashmere, not "cashmere blend."
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