Woven or Knitted fabric?
Woven fabric is when two or more threads are interlaced at right angles to each other. If you were to look at the fabric you would see a set of threads going up and down and then a second set of threads going from left to right.
Knitted is where you make loops with the threads and intermesh them with the previous row and the next. It’s just like granny does but with much smaller loops. Try to imagine a series of small knots being tied and then tied to the next.
Why knitted? Well, it gives the finished fabric more stretch in all directions whereas woven generally only stretches in one direction.
When you combine the stretch of the knitting with the elastane fibres that are incorporated into the threads, you get a lot of stretch, making it ideal for gym wear.
It both flexes with you but also returns to its previous shape. This helps the fabrics last a lot longer and be more comfortable whilst looking great for a long time.