What interlock means
Short answer: Interlock is a double knit where the front and back look alike. The fabric is thicker, holds its shape better and does not curl at the edges. Here we look at how it is knitted and when it is a good choice.
What interlock is
Interlock is a double knit where the front and back look alike. The fabric is thicker and more shape stable than single jersey, and it does not curl at the edges. The name comes from two layers of stitches locking into each other, and you often find this knit in clothes meant to look good for a long time.
How it is knitted
Interlock is knitted with two rows of needles that lock the stitches into each other. That is why the fabric is twice as thick as single jersey with the same yarn, and both sides look alike. It takes more yarn and more time to knit, and that can show in both weight and price.
How it behaves
Interlock holds its shape better, stretches less and wears more slowly. On the other hand, it is heavier and dries more slowly than thinner knit. The fabric feels firm and calm and drapes more evenly. Many notice it does not curl at the edges and looks good after many washes. See bamboo loungewear for men.
Where you meet it
Interlock is found in underwear, sleepwear and better t-shirts, meaning where clothes should look the same after many washes. Makers also use it for pieces that can be worn close to the body without turning see through. See bamboo sleepwear for women and bamboo hoodie for men.
Why it curls less
The edges do not curl because front and back are built alike, so the fabric does not pull toward one side. That makes clothes easier to sew and nicer to wear. You also avoid the wavy edge some thinner knits get when they are cut and not yet joined with a seam.
How you can tell
You can tell whether a fabric is interlock by turning it over and checking whether front and back look alike. With single jersey they differ. Also look at the thickness, because interlock feels firmer and denser, and you can hardly see through it if you hold it up to the light.
Interlock and warmth
Interlock is a little warmer than thinner knit, because the fabric is thicker and holds more air. That makes it good for sleepwear and loungewear in the cooler months, but less obvious for very hot days. Choose the knit by the season and look at how light or heavy the individual piece is described.
How to wash interlock
Wash by the symbols on the label, usually at 30 degrees with a mild detergent. Because the fabric is thick, it dries more slowly, so give it time. Let it dry flat or hanging and avoid high heat. That way the fabric keeps its shape longest, and you enjoy the firm knit for many years.
Interlock or single jersey
Interlock is better for clothes that should keep their shape and for pieces you wear a lot. For light summer pieces single jersey is often the better choice, because it is thinner and dries faster. There is no single right answer. It depends on what you need the piece for and when you wear it.
Frequently asked questions
Can you tell whether a fabric is interlock
Yes. Turn the fabric over and see whether front and back look alike. With interlock they do, and the fabric feels thick and firm, while single jersey has two different sides.
Is interlock warmer
A little, because the fabric is thicker and holds more air. It suits sleepwear and loungewear in the cooler months, but is less obvious for very hot days.
Is it better than single jersey
For pieces that should keep their shape, yes. For light summer pieces no, because single jersey is thinner and dries faster. The choice depends on what the clothes are for.
You can find the full range at Bamboo-Clothing.com.
