What 1×1 and 2×1 mean
Rib alternates columns of face loops and back loops. The numbers count the columns: 1×1 alternates one and one, 2×1 alternates two face columns with one back column, 2×2 does two and two.
More alternation means more stretch and a finer look. A 1×1 rib is the stretchiest and the flattest; it's the classic t-shirt neck. A 2×1 is slightly heavier and more visible, common on tees and sweats. A 2×2 is chunkier and reads as a sweater or a heavy cuff.
What all of them share, and what jersey doesn't, is that the columns let the fabric fold in on itself. That's where the stretch comes from, and it's why rib doesn't curl at a cut edge.
Recovery is the property that matters
Stretch is easy; every rib stretches. Recovery is how completely it comes back, and it's what separates a neck that still sits flat after a year from one that doesn't.
Recovery comes from two places. The structure gives you some. Elastane gives you the rest — a rib with 3 to 5 % elastane recovers far better than a 100 % cotton one, costs more, and is worth it on cuffs, which get pulled over hands twice a day.
If you spec nothing about recovery, you get whatever the mill has. A tech pack row that reads "2×1 rib, cotton, 220 g/m²" hasn't said the thing that decides whether the garment ages well.
The stretch ratio
This is the number people leave off. A rib band is cut shorter than the opening it's sewn into, then stretched on as it's attached. The ratio between the two is a real spec value:
| Position | Band length as % of opening | Why |
|---|---|---|
| T-shirt neck | 85–90 % | Enough tension to lie flat, loose enough to go over a head |
| Sweatshirt neck | 85–92 % | Heavier body fabric needs less pull |
| Cuff | 65–75 % | It has to grip a wrist and pass over a hand |
| Bottom hem | 85–95 % | Enough to blouse the body slightly, not enough to pull it in |
Cut a neck band at 100 % and the neck ripples immediately and gapes later. Cut it at 75 % and it puckers and won't go over a head. Both are common first-sample outcomes and both are cheap to fix once you know the ratio is a number you're allowed to specify.
Speccing rib
- Gauge — 1×1, 2×1, 2×2.
- Weight in g/m², and match it to the body. A 220 g/m² rib on a 140 g/m² jersey looks and feels wrong at the join.
- Composition, with the elastane percentage stated.
- Finished width of the band, folded.
- Stretch ratio, per position.
- Colour, and whether it matches the body or contrasts. A matched rib in a dyed cotton is a real matching problem across dye lots — flag it.
In the Clothix library the rib profile is COT-2X1-220: 2×1, cotton, 220 g/m². It's the standard neck and cuff choice for the jersey and fleece weights alongside it.
Rib as a body fabric
Ribbed tops and dresses use rib for the whole garment, which changes the pattern rather than the trim. Because rib stretches so much crosswise, a rib body is usually cut with negative ease — narrower than the body it goes on — and the fabric does the fitting. That only works with good recovery, so elastane stops being optional. Where that logic leads with heavier gauges.
Jersey, for the body · the neck rib decision on a t-shirt · polo collars · all five structures