The Technical Differences Between Single and Double Knit Fabrics

One-needle knit fabric is made using a single needle bed that create loops in unidirectionally, resulting in a fabric with clearly differentiated front and back surfaces. The right side typically shows a clean, uniform appearance with V-shaped stitches, while the back side appears irregular and nubby. This construction makes single knits light and elastic, but they also tend to curl at the edges and can develop runs or ODM children knitted sweater ladders if one yarn is snagged. Single knits are commonly used in t-shirts, leggings, and other form-fitting garments where ease of movement and stretch are important.

Two-needle knit fabric, on the other hand, is created using two synchronized needle rows that form interconnected loops on front and back at once. This results in a fabric that has no discernible right or wrong side, with a thicker, reinforced build. Because the loops are interlocked, double knits are less likely to curl at the edges and are more resistant to runs or laddering. They also have reduced elasticity compared to jersey, but they offer enhanced form stability and wear resistance. Interlock materials are often used in structured apparel such as blazers, pencil skirts, and trousers where a crisp appearance and dimensional integrity are desired.

In terms of material bulk and heft, interlock weaves are generally denser and cozier than single-knit fabrics due to their double layer construction. This makes them perfect for autumn and winter garments or items meant to maintain their silhouette. Jersey fabrics are more air-permeable and optimal for tropical conditions or sportswear demanding quick-dry properties and range of motion.

The choice between single and double knit depends on the intended use of the garment. One-needle knits offer softness and freedom of motion, while Two-needle knits provide structure, durability, and a more polished appearance. Each serves a unique role in fabric selection, and recognizing their core properties helps in selecting the right fabric for the right purpose.