We’ve updated this guide with notes from our long-term testers. March 2025 Duvet covers can be tricky to change, but using one is essential for extending the life of your comforter (or duvet).

(A note: While the terms duvet and comforter are often used interchangeably, they technically mean different things. A comforter doesn’t require a cover, but a duvet does. I’ve included both ...