Triple Aught Design’s Merino Wool is only sourced from Non Mulesed Merino Sheep. 'Mulesing is the removal of strips of wool-bearing skin from around the breech (buttocks) of a sheep to prevent the parasitic infection flystrike (myiasis).' - Wikipedia
This process is extremely painful to the animal, often leaving exposed, bloody, flesh, and can still cause infections. It is more expensive to source Non Mulesed Merino Wool, however it is also more ethical.