Here's what you want:
1. Baffled or Boxed design
2. Fill Power. 400-500 light duty but still pretty warm. 700 or higher if you live way up North!
3. Thread count of 400 and up (keeps all those feathers from leaking out.
A duvet or cover is a good idea but we don't cover ours. It's nice and white and super plush!
Good luck.