What are they made of? Simba - Odyssey March 29, 2018 01:15 Updated Follow Each of these products has a 70% duck feather and 30% duck down filling, lovingly encased in a 100% cotton cover. Related articles What certifications does the Feather & Down range have? Where are these made? Is the down ethically sourced? What tog level is the duvet? How can a pair of Simba Slippers help me? What is the thread count?