QA brand Woolly Nylon
Woolly Nylon gives a super soft & neat finish to your overlocking, and has beautiful elasticity so it will move & stretch with your fabric.
Most commonly used just in the loopers of your overlocker. If you're having trouble threading it (it's thicker and 'fluffier' than cotton) try a dot of nail polish on the end and then twist it till you have a hard point to thread through!
* Please note the natural colour is called 'natural' by the supplier, but is a darker shade than their natural polyester thread, more of a light coffee colour, as seen in photo.