Peruvian alpaca wool is excellent. I've worn it for 40 years and it's all I wear in winter. This sweater is truly well made and the design is unique and beautiful. The photo does not do it justice. I am 5'1" and weight 110 lbs. The small fit me perfectly. Usually the sleeves on everything I buy are too long but these were the right length for me. It is a fitted style that comes to the waist, but is not cropped. I am very happy with my sweater. Thank you, Ana!