Thanks to Amazon's generous return policy, you can generally send back a duvet cover if it doesn't tick off all the boxes. MaterialYou wouldn't breeze past the material of your bed sheets, so why should a duvet cover be any different? ClosureA duvet cover's job is to protect your comforter from spills, stains, and every mess, but the right closure can keep your insert fresher for longer. "I personally like duvet covers that have concealed ties in the corners to hold the insert in place," McCauley says. Pillow Cases IncludedMany duvet covers come with a few pillowcases or shams to give your bed a cohesive, polished look.