Which comforter is best for hot sleepers?

Lightweight, breathable down-alternative inserts and 'all-season' or 'light warmth' natural inserts are the usual recommendations. Notably, some reviewers warn that even comforters marketed as 'cooling' can sleep warm — one r/Bedding thread describes waking up hot under a lightweight hypoallergenic insert even at 64°F — so hot sleepers should favor the lightest weight available and consider a breathable cotton duvet cover.