What Do Super 120s, 150s and 180s Actually Mean?
If you have ever shopped for a suit, you have probably seen labels like Super 120s, Super 150s or Super 180s stitched inside a jacket or printed on a fabric swatch. Many men assume a higher number simply means a better suit. The truth is more useful than that, and understanding it can save you money and help you choose a fabric that actually fits the way you live.
Quick answer: A Super number measures how fine the wool fibers are. The higher the number, the thinner the fiber. Super 120s wool has a maximum average fiber diameter of 17.75 microns, Super 150s is 16.25 microns, and Super 180s is 14.75 microns. Finer wool feels softer and drapes more smoothly, but it is also more delicate and wrinkles more easily. A higher number means finer, not automatically better.
Where the Super Number Comes From
The Super S classification traces back to the traditional English wool grading system used by the trade in Bradford, England. Originally, the number described how much yarn a pound of wool could produce. Under that old system, a Super 120s rating meant one pound of fiber could be spun into 120 hanks of yarn, each 560 yards long. Finer fibers could be spun into more yarn, so finer wool earned a higher number. dindin
Today the system is standardized internationally. The International Wool Textile Organisation (IWTO) publishes the Fabric Labelling Code of Practice, which governs how “S” and “Super S” designations are used and defines each S number by its maximum fiber diameter. You can read the official table in the IWTO Fabric Labelling Code of Practice published on the FTC website. In the United States, the Wool Suit Fabric Labeling Fairness and International Standards Conforming Act brought these designations in line with the IWTO Code for wool products made on or after January 1, 2007. WikipediaWikipedia
What Is a Micron?
A micron (micrometer) is one millionth of a meter. For context, a human hair is many times thicker than a fine Merino wool fiber. When a mill weaves cloth from thinner fibers, the yarn becomes finer and the fabric becomes lighter, softer and smoother to the touch. That is why fiber diameter is the single biggest factor behind a Super number.
Super 120s vs 150s vs 180s: The Micron Chart
Here is how the most common suit fabric grades compare according to the IWTO standard, also reflected in The Woolmark Company’s fibre quality specification.
| Super Number | Maximum Mean Fiber Diameter | Feel | Durability | Best For |
|---|---|---|---|---|
| Super 100s | 18.75 microns | Firm, crisp | Very high | Daily business wear, travel |
| Super 110s | 18.25 microns | Smooth, structured | Very high | Everyday office suits |
| Super 120s | 17.75 microns | Soft yet resilient | High | All-purpose workhorse suits |
| Super 130s | 17.25 microns | Noticeably softer | Good | Business and events |
| Super 150s | 16.25 microns | Silky, fluid drape | Moderate | Special occasions, executive wear |
| Super 180s | 14.75 microns | Luxuriously soft | Lower | Weddings, galas, occasional wear |
The full IWTO scale runs from Super 80s at 19.75 microns up to Super 250s at just 11.25 microns. Wikipedia
Super 120s: The Smart All-Rounder
Super 120s is the sweet spot for most men. It is fine enough to feel comfortable and look refined, yet sturdy enough to handle regular wear, commuting and dry cleaning. If you are building your first custom suit or want a dependable navy or charcoal for the office, Super 120s or 130s gives you the best balance of comfort, longevity and value.
Fabrics in this range also hold a press well and recover from wrinkles after hanging overnight, which makes them a strong choice for men who travel for work or wear a suit three to five days a week.
Super 150s: Refined Luxury With Some Care
Super 150s wool has a noticeably softer hand and a more fluid drape. The fabric moves with you and catches light with a subtle sheen that looks elegant in a boardroom or at an evening event. Many executives choose Super 150s for a premium suit they wear a few times a week rather than every day.
The trade-off is durability. Finer fibers are more prone to wrinkling, and areas like elbows, seat and inner thighs will show wear sooner if the suit is worn back to back. Rotating your suits and giving each one a day of rest helps a Super 150s garment last for years.
Super 180s: The Luxury Occasion Fabric
Super 180s is exceptionally fine, soft and lightweight, with a drape that feels almost like silk. It is the kind of cloth that makes a statement at a wedding, a black tie gala or a milestone celebration. Many clients choose ultra fine wools for a custom tuxedo or a special occasion suit because it is worn less often and treated with care.
Because the fibers are so delicate, Super 180s is not ideal as an everyday office suit. It creases more easily, wears faster at friction points and needs gentle handling, careful pressing and proper hanging between wears.
Is a Higher Super Number Always Better?
No. A higher Super number tells you the wool is finer, but it does not guarantee quality on its own. The way the yarn is spun, the twist of the yarn, the weave, the weight of the cloth and the reputation of the mill all matter just as much. A well made Super 110s from a respected mill can outperform a poorly finished Super 160s.
Fabric weight is especially important. A heavier Super 150s can feel more durable than a light Super 120s. When you compare cloths, ask about the weight in grams or ounces alongside the Super number. You can learn more about how top mills differ in our guide to Loro Piana vs Zegna suit fabric.
What “Super” Means on a Label
The word Super has a specific legal meaning. Under the IWTO code, Super can only describe fabrics made from pure new wool, though it may also be used for wool blended with rare fibers such as mohair or cashmere. Stretch from elastane is permitted, as is up to 5% non-wool yarn for decorative effects, but the word Super is not allowed for general wool blend fabrics. If you see a polyester blend labeled with a Super number, that is a red flag. ftcftc
The Super S label is voluntary, but when a mill uses it, it must match the code of practice. Organizations like the Cashmere and Camel Hair Manufacturers Institute work to monitor accurate labeling of fine and superfine wools. din
How to Choose the Right Super Number for You
The best fabric is the one that matches how you will actually wear the suit. Think about frequency of wear, climate, travel and the occasion.
If you wear a suit every day, choose Super 100s to 130s for durability and wrinkle recovery. If you want an elevated business suit worn two or three times a week, Super 130s to 150s offers a luxurious feel with reasonable resilience. If you are dressing for a wedding, gala or once in a lifetime event, Super 150s to 180s delivers unmatched softness and drape.
Climate matters too. Finer, lighter wools often breathe beautifully in warm New York summers, while heavier cloths in the Super 100s to 120s range work well for cooler months, sport coats and outerwear. For layering pieces, explore our custom sport jackets and custom overcoats.
How to Care for Fine Wool Suits
Fine wool rewards good habits. Hang your suit on a wide, shaped wooden hanger so the shoulders keep their form. Rotate suits so each one rests at least a day between wears, which lets the fibers relax and wrinkles fall out naturally. Brush the fabric with a soft clothes brush after wearing to remove dust and lint.
Limit dry cleaning to a few times a year, since harsh chemicals and heat weaken fine fibers. Steam or press lightly between cleanings instead. Store suits in breathable garment bags rather than plastic, and keep them away from direct sunlight and moths.
Why Fabric Choice Matters More in a Custom Suit
With an off the rack suit, the fabric is chosen for you. With a custom garment, you choose the cloth, weight, color and pattern based on your lifestyle. At Executive Custom, we guide clients through house fabrics and world famous Italian mills including Loro Piana and Zegna, explaining how each Super number will feel and wear before a single measurement is taken.
Pairing the right fabric with a precise fit is what makes a suit feel like it was made only for you. Complete the look with a custom dress shirt in a fine cotton that complements your suit cloth.
Frequently Asked Questions
What does Super 120s mean in a suit?
Super 120s means the wool fibers in the fabric have a maximum average diameter of 17.75 microns. It is a fine, versatile wool that balances softness and durability, making it one of the most popular choices for everyday business suits.
Is Super 150s better than Super 120s?
Super 150s is finer and softer than Super 120s, but not necessarily better. It feels more luxurious and drapes more fluidly, while Super 120s is more durable and wrinkle resistant. The better choice depends on how often you plan to wear the suit.
Is Super 180s wool good for everyday wear?
Super 180s is generally not recommended for daily wear. Its very fine 14.75 micron fibers feel exceptionally soft but are more delicate, wrinkle easily and wear faster. It is best reserved for weddings, formal events and occasional wear.
What is the most durable Super number for a suit?
Lower Super numbers such as Super 100s to 120s are the most durable. Their slightly thicker fibers resist wrinkles, abrasion and frequent dry cleaning better than ultra fine wools.
Can a wool blend be labeled Super?
No. Under the IWTO Fabric Labelling Code of Practice, the word Super can only be used for pure new wool, or wool blended with certain rare fibers like cashmere, mohair or silk. Standard wool blends cannot carry the Super designation.
Does a higher Super number mean a more expensive suit?
Usually, yes. Finer wool is rarer and more costly to produce, so higher Super numbers generally cost more. However, the mill, weave, cloth weight and tailoring quality also have a major impact on the final price.
Find Your Perfect Fabric With Executive Custom
Choosing between Super 120s, 150s and 180s is easier when you can feel the fabrics in person and get honest advice from an experienced tailor. With nearly 25 years of experience, Executive Custom helps professionals across Long Island and New York find the right cloth and the perfect fit, whether you visit our Great Neck custom tailor studio or book our concierge service in areas like Manhasset and Roslyn.
Browse our gallery for inspiration, then book your appointment or call 516-224-3077 to start building a suit made exactly for you.
