Information from the manufacturer:

Another contribution to the Slow Fashion Movement!

The touch of the yarn is nice and woolly and not at all artificial. The colours look very natural and some have a kind of tweed effect. The thickness and character of the thread makes it very easy to knit with.

The important factor of recycled materials is that the used textiles don't travel around the globe before they get recycled. This is why we buy this yarn from a family owned mill in India, where a lot of surplus textiles exist that can be used for this yarn.

About the production process: First the used garments are sorted according to fibres in factory. Any garment that is 60% and up wool would move along the wool sorting line, irrespective of the balance fibre blend. This could include items such as 100% wool garments, 60/40 wool/polyester, 70/30 wool/ acrylic, 80/20 wool/PA or any other of the many blends where wool is the pre-dominant (major) fibre. Nowadays, most stores hardly ever carry any 100% wool garments. Most of the wool garments available in the mass market are always wool blended.
Once these pre-dominantly wool garments move to the 2nd stage of sorting, they are then sorted according to colour. Once fibre of this wool blend is made, it is never 100% wool but is approx. 65% to 75% wool with rest of the fibres being a mix of Polyester, Viscose, Acrylic or any other fibre. It is impossible to take out only 100% wool garments from the (Post Consumer Used Textiles) PCT as the percentage of such garments would be too little and wastage would be very high due to unpredictable nature of the input feedstock. This percentage of wool changes from season to season, lot to lot and colour to colour. It can never be standard fixed percentage of wool due to the nature of the input feedstock.
Now once these wool garments are shredded into fibre, approximately 10-15% rPET (recycled polyester) is added in it. The rPet added depends on the count of the yarn and fibre blend that is spun. rPet is added to impart strength (as the fibre is weaker compared to virgin fibre) and evenness to yarn to the blend at time of spinning. The rPET added is again 100% Regenerated polyester recycled from PET Bottles.