To use your Sferra Catena King Duvet Cover, simply slip your duvet inside. When it's time to clean, machine wash it in warm water on a gentle cycle. Avoid using bleach as it can weaken the fabric and cause yellowing. Don't use fabric softener either. Wash dark colors separately to prevent color bleeding. Tumble dry on low heat and take it out while it's still damp. For wrinkles, steam iron on the 'cotton' setting on the reverse side of the fabric. Follow these steps to keep your duvet cover looking great for years.