The Eco clog is made with special heritage wools that are sourced from small farms practicing sustainable and cruelty-free farming. The wool is minimally processed and contains no dyes. Alpaca wool is lanolin free. Note on sizing: these are a 39 but Stegmann clogs run small! They fit more like a 38 — size 7.5-8. I love these shoes so much! Super comfortable and beautifully made. The only reason I’m selling is because I had to size up and I missed the return window :)