---
type: "fabric"
name: "Interlock"
slug: "interlock"
fabric_family: "knit_weft"
construction: "weft_knit"
typical_fibers:
  - "Cotton"
  - "Polyester"
  - "Rayon"
weight_gsm: "180–300 g/m²"
price_tier: 3
url: "https://www.fabricatlas.com/fabrics/interlock"
updated: "2025-09-08T02:14:45.865957+00:00"
---

# Interlock

Interlock is a soft, durable knit fabric characterized by its double-layer construction, providing excellent stretch and recovery, making it ideal for a variety of apparel applications.

- **Fabric Family**: Knit Weft
- **Construction**: Weft Knit
- **Typical Fibers**: Cotton, Polyester, Rayon
- **Weight**: 180–300 g/m²
- **Thickness**: 0.8–1.5 mm
- **Typical Width**: 150 cm
- **Price Tier**: $$$ (3 of 5)

## About Interlock

Interlock fabric is a type of weft knit that features two layers of fabric knitted together, resulting in a smooth surface on both sides. This construction gives interlock fabrics a greater thickness and weight compared to single jersey knits, while also enhancing their durability and opacity. Commonly made from fibers such as cotton, polyester, or rayon, interlock is known for its excellent stretch and recovery properties, making it suitable for form-fitting garments, activewear, and children's clothing.

## Knit Properties

- **Wales per Inch**: 6
- **Courses per Inch**: 10
- **Knit Gauge**: 24G

## Stretch Properties

- **Warp Stretch**: 30%
- **Weft Stretch**: 50%

## Performance Properties

- **Air Permeability**: 10 CFM
- **Spray Rating**: 0
- **Evaporative Resistance (Ret)**: 0.5
- **Thermal Resistance (Rct)**: 0.2
- **UPF Rating**: 15

## Appearance & Hand

- **Luster**: Semi Matte
- **Opacity**: Opaque
- **Surface Texture**: smooth
- **Hand & Drape**: Fluid

## Performance Features

- Stretch
- Wrinkle Resistance
- Breathability

## Common Finishes

- Brushed
- Anti Pilling
- Moisture Wicking

## Common Applications

- T Shirts
- Activewear
- Loungewear
- Children'S Clothing
- Underwear

## Common Uses in Detail

### Everyday Apparel

Its soft hand and smooth double-layer surface make interlock a favorite for T-shirts and casual tops. The fabric drapes well against the skin, resists curling at cut edges, and retains its shape through repeated washing, ensuring lasting comfort and a neat appearance.

### Children's Clothing

Gentle against sensitive skin and highly durable, interlock is widely chosen for bodysuits, leggings, and sleepwear for infants and toddlers. Its reliable stretch and recovery accommodate active movement, while its dense construction holds up to the rigorous washing demands of children's garments.

## Care Instructions

Machine wash cold with like colors, tumble dry low, iron on low heat if needed.

- Washing Machine
- Do Not Bleach
- Tumble Dry Low
- Iron Low

## Additional Information

Interlock fabric is often used in applications where a soft hand feel and good stretch are required. Its double-layer construction provides warmth and comfort, making it a popular choice for colder climates.

- **Regional Names**: Interlock knit, Double knit
- **Sourcing Regions**: China, India, Turkey, Pakistan
- **Testing Standards**: Martindale/Rub count, Pilling, Colorfastness to wash/light, Seam slippage, Tear strength

## Fibers in This Fabric

- [Cotton](https://www.fabricatlas.com/fibers/cotton.md)
- [Polyester](https://www.fabricatlas.com/fibers/polyester.md)

## Similar Fabrics

- [Jersey](https://www.fabricatlas.com/fabrics/jersey.md) — Knit Weft
- [Pointelle](https://www.fabricatlas.com/fabrics/pointelle.md) — Knit Weft
- [Rib Knit](https://www.fabricatlas.com/fabrics/rib-knit.md) — Knit Weft
- [Sweatshirt Fleece](https://www.fabricatlas.com/fabrics/sweatshirt-fleece.md) — Knit Weft
- [Cable Knit Fabric](https://www.fabricatlas.com/fabrics/cable-knit-fabric.md) — Knit Weft

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*Source: [Fabric Atlas](https://www.fabricatlas.com/fabrics/interlock) — HTML version of this page.*