The yarn is a mix of acrylic and wool. I usually buy pure wool, even when it isn't necessarily practical. I just prefer the feel of it. But the wool shop which is to be my local for as long as we decide to stay in our current location (somewhere in the county of Worcestershire) has a large selection of yarns, but most of them are blends. If I'm going to be a purist I'll have to travel further afield.
The cable stitch was a cinch. How pleasing to be able to create a complicated effect by simple means. And I like the finished result so much I went straight out to buy more (blended) wool and I am knitting a shorter pair. I liked the idea of a long-armed mitten, but I think I will rarely have exposed forearms in the next few months.