Can you machine wash these comforters?

Most down-alternative inserts (Bedsure, Utopia, UGG) are explicitly machine washable, which is a major reason verified-purchase reviewers favor them. Natural goose feather/down inserts vary: some list machine-wash care while others, per retailer review snippets, call for dry cleaning. Reviewers consistently note natural down takes hours to fully dry, so a large-capacity machine and dryer help.