“100% wool” is a fiber-content claim, not a quality grade — it means every fiber in the body of the garment is wool, with no other fibers blended in.
Under the Wool Products Labeling Act, a product labeled “100% Wool” or “All Wool” must contain only wool — no cotton, polyester, or acrylic hiding in the weave. The word “wool” describes what the fibers are made of, nothing more; it says nothing about softness, warmth, durability, or pilling.
The “100% Wool” Label Rule, In Plain Terms
Aside from permitted ornamentation like decorative stitching, a 100% wool claim means wool and only wool. The FTC’s normal tolerance for small label variations does not apply when a product claims to be entirely wool. Most textile and wool products sold in the US must also disclose fiber content with exact percentages, country of origin, and manufacturer or marketer identity.
One surprise: the Wool Act requires wool content disclosure even when wool is under 5% of total fiber weight. For non-wool fibers, the FTC generally uses a 5% threshold, so trace amounts under that line are often grouped as “other fibers.” A garment can legally hide a sprinkle of polyester — but not a sprinkle of wool.
Is Merino Wool Different From Regular Wool?
Merino is a type of wool from Merino sheep, not a separate fiber category; FTC rules treat it as wool. A product can only say “100% Merino Wool” if all fiber content is merino. Blend merino with nylon — common in socks and base layers — and the label cannot claim 100% merino, no matter how prominent the breed name. Woolmark notes merino’s fine, soft fibers, but label rules care about percentage, not reputation.
Why Wool Blend Percentages Matter
If a garment contains wool plus any other fiber, the label must state exact percentages — “80% Wool, 20% Cashmere,” not “cashmere blend.” Calling something “merino” or “cashmere” without a full breakdown misleads shoppers into assuming the named fiber is the whole story. A “wool blend” could be 95% wool or 30% wool, and those sweaters will feel and wear nothing alike.
| Label Wording | What It Legally Means | What To Watch For |
|---|---|---|
| 100% Wool / All Wool | All fiber content is wool, minus permitted ornamentation only | No tolerance for label variation; the claim must be exact |
| 100% Merino Wool | All fiber content is merino wool specifically | Any nylon or other fiber added means this label is off-limits |
| 80% Wool, 20% Cashmere | A wool blend with disclosed exact percentages | Percentages are mandatory, not optional |
| “Cashmere Blend” (no percentages) | Non-compliant for a US wool product label | Blend names alone don’t satisfy the fiber-content rule |
| Under 5% wool content | Still must be disclosed under the Wool Act | Wool has no 5% disclosure exemption the way other fibers do |
| Under 5% non-wool fiber | Often grouped as “other fibers” on the tag | Trace amounts can be legally lumped together |
The FTC publishes the full Wool Products Labeling Act text for the statutory language. Practically: read the fiber breakdown, not the front of the tag. A dense 100% wool knit behaves differently from a lighter merino layer, and both differ from a 50/50 blend made to hit a price point. If you’re comparing women’s knits and want options that skip synthetic fillers, this roundup of a 100 wool sweater for women covers styles that hold to that standard.
Reading Wool Labels Without Getting Fooled
- Check for percentages, always. A blend claim without numbers is a red flag.
- Don’t treat “merino” as a separate category. It’s wool from a specific breed, subject to the same disclosure rules.
- Trust “100% Wool” only at face value. It guarantees composition, not quality — softness, thickness, and durability still vary widely.
Those checks answer the label question. What they can’t tell you is how the fabric feels or holds up — that’s what trying it on and reading care instructions are for. Official sources cover fiber content and disclosure requirements; they don’t publish performance specs, prices, or care guidance for specific garments.
FAQs
Can a sweater say “100% wool” if it contains a small amount of another fiber?
No. FTC guidance says the tolerance for minor label variation does not apply when a product is labeled “100% Wool” or “All Wool.” The only exception is permitted ornamentation, like decorative stitching not part of the main fabric. Any functional fiber blended into the body breaks the claim.
Is merino wool a different material than regular wool?
No — merino is wool from Merino sheep, and FTC rules treat it as wool. A “100% Merino Wool” label requires all fiber content to be merino, and blending it with nylon or any other fiber makes that label invalid.
What does it mean if a label just says “wool blend”?
A compliant US label must state exact fiber percentages, such as “80% Wool, 20% Cashmere.” Generic wording without numbers does not satisfy the fiber-content requirement. Treat an unquantified blend name as incomplete information.
References & Sources
- Federal Trade Commission. “Wool Products Labeling Act” Statutory text behind the 100% wool and disclosure requirements.
- Federal Trade Commission. “Wool Products Labeling Rules” Covers fiber-percentage disclosure, the 5% thresholds, and the entirely-wool claim caveat.
- Woolmark. “What Is Merino Wool & How Is It Made?” Explains merino’s origin and fiber characteristics.