From Knitting for Olive: 

Our Merino wool provides excellent comfort and functionality, making it perfect for those who love long walks, winter hikes and camping under night skies. The wool’s natural fibers will keep you cozy in chilly weather while allowing your body to release heat in warmer temperatures. And don’t worry, our Merino wool comes from sheep where mulesing isn’t practised, so you can craft ethical, sustainable knitwear when using our yarn.