Merino wool fabric
Merino wool fabric is made from the fleece of merino sheep — finer than standard wool, softer next to skin, and with natural properties that make it exceptional for active and everyday wear.
What makes merino fabric different from regular wool
The defining difference is fiber diameter. Merino wool typically measures 15-24 microns in diameter. Standard wool from non-merino breeds measures 25-40 microns or more. At around 30 microns and above, wool fibers are stiff enough to prick the skin — the sensation people describe as itchy. Below about 25 microns, fibers are fine enough to bend rather than prick, which is why merino fabric feels soft directly against skin while standard wool can feel uncomfortable. The finer the fiber, the softer the fabric — superfine merino under 18.5 microns is exceptionally soft and suitable for even sensitive skin.
How merino fabric is made
Merino fleece is shorn, scoured to remove lanolin and debris, and combed to align the fine fibers before spinning. Most merino clothing fabric is knitted rather than woven — jersey and interlock knit structures are the standard for base layers, T-shirts, and everyday garments because they stretch with the body and recover their shape. Woven merino is used for suiting, tailored trousers, and structured pieces where a more formal appearance is needed. Both constructions use the same fiber; the weave or knit structure determines the finished fabric's stretch, drape, and appearance.
Weight and what it means
Merino fabric is commonly described by gsm (grams per square meter). Ultralight merino at around 150gsm is used for base layers in mild to moderate conditions — it is thin enough to wear under other layers without adding bulk. Midweight merino at around 200gsm is the most versatile — used for everyday T-shirts, long-sleeve tops, and light layering pieces. Heavyweight merino at 250gsm and above is used for outerwear, heavier knitwear, and cold-weather base layers. When buying, matching the gsm to the intended use prevents the common mistake of choosing fabric that is too light for cold weather or too heavy for an active layer.
What to look for when buying
Micron count is the most useful softness indicator — under 18.5 microns for superfine, 19-24 for standard fine merino. GSM for appropriate weight. Blend percentage: some merino fabrics are blended with 5-20% nylon to improve durability in high-abrasion areas like heels and underarms; this is a practical tradeoff rather than a compromise. For certifications, ZQ Merino and RWS verify animal welfare and responsible land management. OEKO-TEX Standard 100 covers chemical safety in processing and dyeing. Not every good merino product carries these, but their presence is a reliable signal of responsible sourcing.
Merino fabric vs synthetic performance fabric
Merino regulates temperature in both directions — it insulates when cool and releases heat when warm. Polyester does not: it traps heat in one direction only. Merino resists odor naturally through its fiber structure; polyester absorbs and holds odor from the first use. Merino biodegrades at end of life; polyester does not and sheds microplastics in every wash. Synthetic performance fabrics have advantages in quick-dry speed and, in some constructions, abrasion resistance. But for anything worn against skin over multiple days or in variable conditions, merino's natural properties make it the more practical and more sustainable choice.
Canadian women's natural fiber clothing in linen, merino, silk, and organic cotton.
Travel-focused casual clothing made from linen, organic cotton, merino, and alpaca.
Outdoor basics and activewear in merino wool and organic cotton for men and women.
American-made men's wardrobe staples in Supima cotton, linen, hemp, and merino.
Sydney-made custom-fit organic cotton, hemp, and merino clothing for men and women.
Vermont-made merino wool socks for men, women, and kids with a lifetime guarantee.
Women's premium apparel in organic linen, Pima cotton, and merino with a take-back program.
UK surf and outdoor brand making apparel in organic cotton, hemp, and merino.
Canadian casual and basics brand in organic cotton for men and women.
Cashmere and merino knitwear for men and women at mid-market prices.
New Zealand merino wool outdoor base layers and apparel for men, women, and kids.
Norwegian women's activewear brand making merino wool base layers and technical clothing for outdoor sports.
Fair Trade knitwear in cotton, linen, alpaca, and merino for women.
Merino wool outdoor apparel for men and women with a Himalayan-inspired aesthetic.
French sustainable knitwear brand making merino, alpaca, and organic cotton sweaters, cardigans, and vests for everyday wear.
French premium knitwear in organic cotton, merino, mohair, alpaca, and yak for men and women.
100% New Zealand merino wool base layers and travel clothing for men and women.
New Zealand ZQ merino wool ski and outdoor apparel for men and women.
Merino wool and organic cotton clothing for babies through age 14.
Outdoor brand making apparel in organic cotton, hemp, and merino wool with strong environmental advocacy.
Full-range organic brand offering clothing and underwear in organic cotton, linen, hemp, and merino.
Luxury knitwear brand offering cashmere and merino wool sweaters, cardigans, and accessories for women.
Men's activewear and underwear in organic cotton and merino wool.
Merino wool socks, base layers, and outdoor apparel for men, women, and kids.
Japanese outdoor brand making merino wool and natural material apparel for men and women.
Spanish casual basics in hemp, organic cotton, and merino for men and women.
Merino wool travel clothing for men and women designed to be worn for weeks between washes.
Women's ZQ merino wool dresses engineered to be worn for 100 days without washing.
Everyday merino wool women's clothing including dresses, tops, leggings, and outerwear designed for all-day versatility.
UK knitwear brand in merino, cashmere, linen, cotton, and silk for men and women.
Merino wool activewear and base layers for men and women at mid-market prices.
Common questions about merino wool fabric
What micron count is best for merino wool fabric?
For next-to-skin wear — base layers, T-shirts, underwear — look for merino under 18.5 microns, which is classified as superfine or ultrafine. This is soft enough that most people with sensitive skin experience no itching. For mid-layers and outerwear where the fabric is not directly against skin, 19-24 microns is fine and significantly less expensive. The micron count is sometimes listed on product pages for technical outdoor clothing brands but less commonly in mainstream fashion.
Is merino wool fabric good for summer?
Yes — merino regulates temperature in both directions. Lightweight merino (150-200gsm) wicks moisture away from skin, breathes, and releases heat in warm conditions. It is one of the few fabrics that works across a wide temperature range in a single layer. Many hikers, travelers, and active people wear lightweight merino in summer specifically because it handles both heat and unexpected cool weather, and because it resists odor so a single garment lasts multiple days without washing.
How do you wash merino wool fabric?
Most merino clothing can be machine washed on a wool or delicates cycle in cool water. Use a gentle detergent — wool-specific detergents are best. Do not use fabric softener, which can coat and mat the fibers. Lay flat to dry rather than hanging, which stretches wet merino out of shape. Non-superwash merino requires more careful hand washing. Never tumble dry unless the label specifically confirms it is safe. Merino actually resists odor so well that many garments can simply be aired between wears rather than washed after each use.
What is the difference between merino and regular wool fabric?
The primary difference is fiber diameter. Merino wool is finer — typically 15-24 microns — compared to 25-40+ microns for standard wool from non-merino breeds. Finer fibers are softer and more flexible, bending rather than pricking the skin. The result is that merino fabric is comfortable against bare skin for most people, while standard wool can feel scratchy. Both share the core properties of wool — temperature regulation, moisture wicking, odor resistance, biodegradability — but merino delivers them with greater comfort for next-to-skin applications.
Is merino wool fabric worth the price?
For next-to-skin wear, yes — if the alternative is synthetic. Merino regulates temperature, resists odor, and biodegrades; polyester does none of these. A merino base layer that can be worn multiple days without washing and lasts three to five years compares favorably in cost-per-wear to cheaper synthetics replaced more often. For casual garments where next-to-skin softness matters less, standard wool or wool blends offer similar durability at lower cost. The value case for merino is strongest in active and travel contexts where odor resistance and temperature range reduce how much clothing you need to carry.
Every brand in The Plain Thread directory uses natural fibers. Browse brands making clothing from merino wool.
Browse merino clothing