My favourite yarn is a animal based production such as wool, mohair, cashmere, silk. I also love the combination of these yarns, also combinations of one of them with cotton, because they keep the same positive characteristics.
Just new in my hands is a yarn with 60% milk protein combined with wool and cashmere. Its soft like cashmere and smooth as silk. I like it although not yet haven knitted it.
I love degrade yarns, alpaca-silk or merino superwash.
I prefer to use lace-weight or fingering-weight yarns which are very smooth and softly.
But I also love to work with cotton, especially when designing accessoires for spring and summer.