The "Super" designation on suiting fabric is one of the most consistently misunderstood terms in men's fashion. It appears on hang tags, in fabric bunch descriptions, and in sales pitches, typically as a signal of quality — "Super 150s!" appears impressive. But what the number actually measures, and what it means for how the fabric performs, is almost never explained.
What the Super Number Measures
The Super number measures the fineness of the wool fiber used in the fabric. Specifically, it reflects the fiber's micron count — the diameter of individual wool filaments, measured in millionths of a meter. A lower micron count means a finer, thinner fiber. The Super number is derived from a mathematical relationship with this micron measurement.
A Super 100s fiber is approximately 18.5 microns in diameter. A Super 130s is approximately 17.5 microns. A Super 150s is approximately 16.5 microns. The differences are extremely small in absolute terms, but they are meaningful in the finished fabric.
What Higher Numbers Actually Mean
Softness: A finer fiber produces a softer fabric. Super 150s cashmere-soft wool feels noticeably different from Super 100s wool against skin.
Drape: Fine fabrics tend to drape more fluidly than heavier, coarser constructions.
Surface quality: Higher Super fabrics have a smoother, more refined surface with less visible texture.
Delicacy: This is the trade-off. A finer fiber is more fragile. Super 150s and above require more care than Super 110s — they are more prone to pilling, more sensitive to moths, and less forgiving of aggressive pressing or dry cleaning.
What Higher Numbers Do NOT Mean
Super number is not a quality measure in absolute terms. A well-spun, well-woven Super 110s from Holland & Sherry is a superior fabric to a poorly made Super 150s from a commercial mill. The Super number measures fiber fineness, not the quality of the spinning, weaving, finishing, or dyeing.
This is one of the most important distinctions to understand when buying fabric or making sense of suit claims. A retailer selling a "Super 180s" suit at a low price is either using fiber that barely meets the technical threshold or is measuring by different standards. The fiber may technically qualify as Super 180s while the fabric is poorly made.
The best suiting fabrics are made by mills like Holland & Sherry, CARNET, and Fratelli Tallia Di Delfino — whose Super 120s is a more impressive fabric than most mills' Super 150s, because the quality of fiber selection, spinning, and finishing is significantly higher.
The Practical Guide
Super 100s–110s
Use case: Daily working suit, travel suit, a suit worn five days a week in a demanding environment.
Character: Durable, practical, resilient. More textured surface. Holds a crease well.
Best for: Finance, law, consulting professionals who need a suit that performs through heavy use.
Super 120s–130s
Use case: The most versatile range for most people. A daily business suit that also works for formal occasions.
Character: Soft hand, clean surface, good drape. Fine enough to feel luxurious, durable enough for regular wear.
Best for: Most Vestium NY clients' primary suits. Holland & Sherry Super 120s is the standard recommendation for a first or main suit.
Super 150s and above
Use case: Special occasion suits, formal wear, pieces worn infrequently.
Character: Extremely fine, very soft, highly refined surface. Beautiful in photographs and in a well-lit room.
Trade-offs: Requires significantly more care. Not practical for daily wear. Will show wear faster than lower Super numbers under equivalent use.
Best for: A tuxedo, a wedding suit, a formal piece worn for special occasions. Not a daily driver.
A Note on Cashmere
The Super scale applies to Merino wool. Cashmere is measured differently — by fiber diameter in microns, typically 14–18 microns, which would translate to Super 160s or above in wool terms. Cashmere suiting cloths are among the softest available but are also among the most delicate.
Cashmere-wool blends (common in winter sport coats and luxury suits) provide cashmere softness with more structural integrity than pure cashmere.
Frequently Asked Questions
Is Super 150s better than Super 120s?
Not in absolute terms. Super 150s is finer and softer; Super 120s is more durable and practical. For daily wear, Super 120s is the better choice for most people. For special occasion use, Super 150s is appropriate and desirable.
What Super number does Vestium NY typically use?
For business suits and everyday pieces: Holland & Sherry Super 120s is our most-recommended starting point. For tuxedos and formal wear: Super 120s and above. For sport coats and casual pieces: the appropriate weight depends on the specific cloth.
Can I tell the Super number of a fabric by touch?
Experienced hands can approximate. The smoothness and fineness of the surface, and the softness against skin, provide some indication. But two Super 120s from different mills can feel quite different from each other — the Super number is one variable among many.
Does Super number affect how a suit is made?
Yes. Very fine fabrics require more care from the tailor — pressing must be gentler, handling must be more delicate, and the construction techniques need to account for how the fabric responds. This is one reason why very fine fabrics are best made by experienced tailors rather than in mass production.
Work with Vestium NY. Vestium NY sources Holland & Sherry, CARNET, and Fratelli Tallia Di Delfino fabrics across a range of Super numbers. We help clients select the right weight and fineness for their specific use.