This sweater is hand knit using an 80% wool/20% acrylic blend which is perfect for kids because it is soft/non-itchy and warm. This yarn is also machine washable - although we personally hand washed and laid flat to dry as we do with all of our hand knit items. My daughter wore for one season and it is in perfect condition. This is a hard one to part with because we love it so much! I estimate a size 10 but can give measurements, if needed!