Merino wool is a fine, soft natural fibre from Merino sheep. Its fibres are much thinner than regular wool, so it feels smooth rather than itchy. It breathes, regulates temperature, resists wrinkles and odour, and biodegrades naturally, which makes it ideal for tailoring worn from morning to night.
Most people know wool as the heavy, scratchy jumper at the back of the wardrobe. Merino is something else entirely. It is the fibre behind the world’s finest suiting, and the reason a good wool blazer can feel light, cool and comfortable all day.
At SIDDIQI, every piece in Launch 01 is made from 100% merino wool. This guide explains what merino is, what makes it different, and why we chose it for tailoring designed to move from desk to dinner.
Where Merino Wool Comes From
Merino wool comes from the Merino sheep, a breed developed in Spain during the Middle Ages. Spain guarded the breed so closely that exporting Merino sheep was forbidden for centuries. Its fleece was one of the most valuable goods in Europe.
Today, most of the world’s merino is grown in Australia, with New Zealand, South Africa and South America also producing fine wool. Merino sheep are shorn once a year, usually in spring. The fleece grows back, which makes wool a renewable fibre.
After shearing, raw fleece is scoured to remove dirt and lanolin, a natural grease. It is then combed, spun into yarn and woven into fabric. For tailoring, merino is usually woven as a wool twill, a diagonal weave that drapes well and holds a sharp shape.
What Makes Merino Wool Different from Regular Wool?
The difference comes down to one measurement: fibre diameter, measured in microns (one thousandth of a millimetre).
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Merino wool: fibres usually measure under 24 microns, and the finest are below 18.
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Regular wool: fibres from other breeds are often 25 to 40 microns or more.
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Human hair: roughly 50 to 100 microns.
Finer fibres bend when they touch your skin instead of poking into it. That is why merino feels soft while coarse wool prickles.
What Is Merino Wool Crimp?
Merino fibres also have a natural wave called crimp. Crimp traps tiny pockets of air and acts like a spring. It gives merino fabric its warmth, its stretch and its ability to bounce back into shape.
Merino Wool vs Other Common Fabrics
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Merino wool: soft and smooth, highly breathable, recovers well from wrinkles, biodegradable. Best for tailoring and all-day wear.
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Regular wool: can prickle, breathable, recovers well from wrinkles, biodegradable. Best for outerwear and chunky knits.
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Cashmere: very soft, moderately breathable, holds shape less well, biodegradable. Best for knitwear and scarves.
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Cotton: soft, moderately breathable, creases easily, biodegradable. Best for shirts and casual wear.
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Polyester: feel varies, poor breathability, resists creasing, not biodegradable. Common in budget suiting.
What Are the Benefits of Merino Wool?
1. Merino Wool Is Breathable
Merino fibres absorb moisture vapour from your skin and release it into the air. Wool can take up around 30% of its own weight in moisture before it feels damp. Synthetic fabrics like polyester cannot do this, which is why they feel clammy.
2. Merino Wool Regulates Temperature
Merino keeps you warm when it is cool and feels comfortable when it is warm. The crimp traps insulating air, while the fibre manages moisture as your body heats up. The result is a fabric that adapts, rather than a fabric built for one season.
3. Merino Wool Resists Wrinkles
Thanks to crimp, merino fibres spring back after they bend. Creases from sitting at a desk, a long drive or a flight tend to fall out when the garment hangs overnight. For a blazer worn to work and then to dinner, this matters.
4. Merino Wool Resists Odour
Wool absorbs sweat vapour before bacteria can break it down, and its fibre structure holds on to odour molecules. You can wear merino more than once between cleans, which also means less washing.
5. Merino Wool Is Naturally Sustainable
Merino is renewable, because sheep grow a new fleece every year. It is also biodegradable: wool breaks down in soil, while polyester can persist for centuries. A merino garment that lasts for years also replaces several cheaper ones.
Is Merino Wool Itchy?
Fine merino is not itchy for most people. Itch comes from coarse fibres, generally above about 30 microns, pressing into the skin. Merino fibres are fine enough to bend away instead.
If you have found wool itchy before, it was likely a coarser wool or a blend. In tailoring, a smooth lining adds another layer of comfort. SIDDIQI blazers are fully lined in viscose, so the merino sits against your blouse, not your skin.
Is Merino Wool Good for Summer and Hot Climates?
Yes, with the right weight. Lightweight merino breathes better than most synthetic suiting, so it stays comfortable in warmer weather.
For very hot climates like a Dubai summer, think about where you will wear it. A structured merino blazer is ideal for air-conditioned offices, evening events and travel. It keeps you comfortable when you move between the heat outside and cool rooms inside.
In spring, autumn and winter, merino works outdoors in every one of our markets, from London to Toronto to Abu Dhabi.
What Does “Super 70s” Wool Mean?
You will often see a “Super” number on fine suiting, such as Super 70s, Super 100s or Super 120s. The Super number describes fibre fineness, under a scale set by the International Wool Textile Organisation (IWTO). The higher the number, the finer the fibre.
Higher is not always better. Very high Super numbers feel silky but are more delicate and crease more easily.
Super 70s sits at the durable end of fine suiting. It is smooth to touch but strong enough to hold a structured shoulder, keep a crisp line and survive years of regular wear. That balance is why SIDDIQI uses Super 70s merino for its blazers and skirts.
Merino Wool vs Cashmere: What Is the Difference?
Cashmere comes from cashmere goats, not sheep. It is exceptionally soft and warm, and it is best suited to knitwear. But it is less durable, pills more easily and does not hold a tailored shape well.
Merino is the better choice for tailoring. It drapes, holds structure, recovers from wrinkles and stands up to daily wear.
Choose cashmere for a jumper; choose merino for a blazer.
Why Is Merino Wool Ideal for Workwear?
A workday asks a lot of clothing. You sit, commute, present and often head straight to dinner. Merino handles all of it: it breathes through a long meeting, sheds creases from your chair and looks sharp at 9pm.
That is the thinking behind SIDDIQI. Each piece pairs 100% merino wool with hand block printing, a centuries-old craft in which patterns are stamped onto fabric by hand with carved wooden blocks. Read how hand block printing works.
SIDDIQI Merino Wool Tailoring
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The Confidence Blazer is cut from deep green merino twill, block printed in black, with sculptural bell sleeves and structured shoulders.
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The Versatility Blazer brings the same craft to a black printed blazer that moves easily from office to evening.
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Each blazer has a matching skirt, so you can wear it as a full skirt suit or style the pieces separately. Explore the blazer and skirt sets.
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The Hope Dress brings merino’s comfort to a one-piece look.
Every piece is made to order in small batches, so nothing is overproduced.
How to Care for Merino Wool
Good care keeps merino looking sharp for years.
1. Air Merino Wool Between Wears
Hang the garment somewhere with good airflow for a day. Merino refreshes itself, so it rarely needs cleaning after one wear.
2. Rest Merino Tailoring Between Wears
Give tailoring 24 hours between wears so the fibres recover their shape.
3. Use a Shaped Hanger
A wide wooden hanger supports the shoulders of a blazer.
4. Brush Merino Instead of Washing It Frequently
A soft clothes brush lifts dust and keeps the surface clean.
5. Steam Out Creases
Steam relaxes wrinkles without the shine an iron can leave.
6. Dry Clean Merino When Needed
SIDDIQI pieces are dry clean only, which protects the hand block print, the lining and the tailored structure.
7. Store Merino Wool Properly
Keep merino in a breathable garment bag, away from sunlight, with cedar to deter moths.
Frequently Asked Questions About Merino Wool
What Is Merino Wool?
Merino wool is a fine natural fibre from Merino sheep. Its fibres are thinner than regular wool, so it feels soft, breathes well, resists wrinkles and odour, and biodegrades naturally.
Is Merino Wool Better Than Regular Wool?
For clothing worn close to the body, merino is generally more comfortable because it is finer and softer than coarse wool. Its characteristics also make it well suited to tailored clothing.
Does Merino Wool Wrinkle?
Merino resists wrinkles well. Its natural crimp lets the fibres spring back, so most creases fall out after the garment hangs overnight.
Can You Wear Merino Wool in Hot Weather?
Yes. Lightweight merino is breathable and manages moisture well. In very hot climates, a merino blazer is particularly suitable for air-conditioned offices, evenings and travel.
Is Merino Wool Sustainable?
Merino is renewable and biodegradable. Sheep regrow their fleece every year, and wool breaks down naturally in soil, unlike synthetic fibres.
How Long Does Merino Wool Clothing Last?
With good care, merino tailoring can last for many years. Airing, resting between wears and dry cleaning only when needed can all help extend its life.