I used this duvet cover exclusively for five years, and it has held up beautifully — it’s still as clean, smooth, and crisp as day one. I have it in slate blue, a color that I think works like ...

Technically, a comforter is a covering that’s sewn shut, usually comes in a pattern or color, and doesn’t require a cover—think bed-in-a-bag bed toppers. A duvet is plain, usually white ...