There are lots of comforter fills to choose from, and the “best” one really depends on what you’re looking for. If you want an inexpensive, low-maintenance filling, polyester or rayon down alternatives are probably your best bet. These synthetic downs are also great if you’re looking for a more sustainable, cruelty-free alternative to animal-based fills. If you’re looking for lightweight, breathable warmth, a down comforter will probably be up your alley. And if it’s a cool bedspread you’re after, natural plant fibers like cotton, bamboo, or eucalyptus might be for you.