Microplastics
Material-class model assumption
Wool is recorded as Natural Fiber with no listed microplastic polymer, so it does not add a microplastic-source penalty.
Natural Fiber
Wool clothing: health and sustainability score
Wool is an animal fiber. A wool percentage is useful composition information, but it does not describe the whole fabric, its surface treatment or your skin’s response.
Where it shows up
For knitwear, socks and outerwear, compare blend, fabric weight, care instructions and construction. A sock can combine wool with synthetic reinforcement and stretch.
What the evidence supports
Fiber names and percentages are distinct from evidence about processing. Responsible-fiber certification also has a defined scope rather than being a universal chemical-safety claim.
What remains unknown
The label may leave animal-welfare verification, shrink-resistance treatment, dyes and individual comfort unresolved.
Primary sources
- Textile fibre names and definitions, Annex I (European Union)
- Standards (Textile Exchange)
Reviewed 2026-09-05.
How the model interprets this fiber
Greener Closet scores the disclosed share using the corresponding MaterialsDB record. Its factor defaults are model assumptions, not product testing, a factory life-cycle assessment or independently validated quantitative calibration.
No default penalty
PFAS uncertainty
Material-class model assumption
MaterialsDB does not apply a base PFAS penalty to Wool. Product-level water, stain, or performance finishes can still change PFAS risk.
Half-life and biodegradability
Material-class model assumption
Wool has no persistence penalty in MaterialsDB, which generally reflects better biodegradability than petroleum-based synthetics.
Fiber shedding
Material-class model assumption
Wool has no default microfiber-shedding penalty in MaterialsDB. Garment construction and laundering still matter.
Manufacturing energy
Material-class model assumption
Wool carries a manufacturing-energy penalty, so production impacts remain part of the score even when microplastic risk is low.
Other fibers to compare
Best next step
Paste the full fabric label into the homepage checker. A 95% cotton, 5% elastane garment will not score the same as 100% cotton, and the checker handles those percentages.
Use the material-label checkerRelated scored products
97 visible scored products include Wool.
Raglan Sweater in Ultrasoft Merino
Brand: Everlane
97/100
Women'sSweaters
The Apollo 100% Merino Wool Shorts
Brand: Ryker Clothing Co
97/100
Men'sShorts
Women's Wool Cruiser Waterproof
Brand: Allbirds
97/100
Women'sShoes
Shell Jewel Cut-Out Short Dress
Brand: From Future
97/100
Women'sDressesShorts
Men's Merino Boxers By Woolly | RWS Certified | Soft, Stink Free, Seattle Designed
Brand: Woolly Clothing Co
97/100
Men'sUnderwearShorts
100% Merino Wool Boxer Briefs for Men, Slim Fit Breathable Moisture Wicking Underwear for Hiking, Travel & Everyday
Brand: WooLogic
97/100
Men'sUnderwearShortsActivewear
Double-Faced Merino Wool Bomber Jacket
Brand: Quince
97/100
Women'sCoats and Jackets
Willow Organic Throw
Brand: Coyuchi
96/100
HomeBlankets
Category guides where Wool shows up
Wool is on the look-for or watch-out list for these categories. Each guide ranks scored products and explains what the fiber label can tell you.
Common questions
Does Wool clothing shed microplastics?
Wool has no listed microplastic polymer in MaterialsDB. Garment construction and washing can still release fibers.
Is Wool biodegradable?
Wool has no half-life penalty in MaterialsDB, which is a better biodegradability signal than petroleum-based synthetics.
How should I check a Wool blend?
Use the Greener Closet material-label checker with the full percentage label, because blends can change the final score even when Wool is only one part of the garment.