Definition
Interlock knit is a double-knit fabric made by interlocking two layers of rib stitches so both faces look identical and smooth. It feels soft and substantial, holds its shape well, and resists curling at the edges. That combination makes it a favorite for premium tees, polos, and kidswear.
Definition
Interlock is a variation of rib knitting. Two sets of needles knit two fabrics at once and tie them together stitch by stitch, so the loops on the front sit directly behind the loops on the back. The result is a thicker, denser fabric than a single jersey, with no visible reverse side.
A practical example: a heavyweight cotton interlock polo. Pick it up and both inside and outside feel equally smooth, the collar lies flat without rolling, and the body has a quiet, structured drape that reads as quality.
How interlock knit works
The knit is built on two interlocked rib structures. Standard 1x1 rib alternates knit and purl loops on each face. Interlock takes two of those rib fabrics and joins them so each face shows only knit loops, hiding the purls inside. This is why both sides match and why the fabric is heavier per square meter than a comparable jersey.
That construction gives interlock its signature properties. It is stable, so it stretches less and recovers better than jersey, which keeps printed and embroidered logos sitting flat over time. It does not curl at cut edges, which makes cutting and sewing cleaner. It also feels fuller and softer against the skin, a quality buyers notice immediately.
The trade-offs are weight and cost. Interlock uses more yarn than single jersey, so garments cost a little more and feel warmer. It can also shrink if washed hot, so fabric is often pre-shrunk or combed and ringspun for stability. For most branded apparel that extra body is a feature, not a problem, because it signals a garment people will keep.
Interlock knit in branded merch
- Premium polos and tees: Interlock gives staff and event apparel a soft, structured hand that holds embroidery and prints crisply, ideal when the garment represents your brand.
- Kidswear and family packs: Its softness and stable edges make it a safe, comfortable choice for children's sizes in family-oriented campaigns and onboarding gifts.
- Layering pieces and zip tops: The fabric's body and flat edges suit collared layers and lightweight jackets where a clean, finished look matters for client-facing teams.
Interlock knit is a smooth, double-faced fabric where two ribbed layers lock together, giving both sides the same clean finish.
a heavyweight cotton interlock polo. Pick it up and both inside and outside feel equally smooth, the collar lies flat without rolling, and the body has a quiet, structured drape that reads as quality.
5 tips to elevate your Interlock knit strategy
| Tip | Steps |
|---|---|
| Match weight to use | Choose 200 gsm or heavier interlock for polos and outerwear, lighter for soft tees. |
| Pre-shrink the fabric | Specify combed, ringspun, or pre-shrunk yarn to limit shrinkage after washing. |
| Use it for embroidery | The stable surface holds stitches flat, so favor interlock over jersey for logos. |
| Wash cool | Recommend 30 degrees and low-heat drying on care labels to protect shape and color. |
| Test color depth | Interlock's density takes dye richly, so order a sample to confirm brand colors. |
Key Terminologies
Frequently Asked Questions
Is interlock knit better than jersey?
It depends on the goal. Interlock is heavier, smoother on both sides, and more stable, which suits premium garments. Jersey is lighter and cheaper, better for high-volume basics.
Does interlock knit shrink?
It can shrink if washed hot, like most knitted cotton. Pre-shrunk or combed ringspun yarn reduces this, and cool washing protects the fit.
Why does interlock look the same on both sides?
Because two ribbed layers are interlocked so only knit loops show on each face. The purl loops are hidden inside, giving a clean double-faced finish.
Is interlock good for printing and embroidery?
Yes. Its dense, stable surface holds prints flat and keeps embroidery stitches from puckering, which keeps logos looking sharp over time.
What weight of interlock should I choose for polos?
Aim for around 200 gsm or heavier. That gives a structured drape and a premium hand, while lighter weights suit soft everyday tees.