Is real mulberry silk worth it over satin?

It depends on priorities. Mulberry silk (measured in momme, typically 19–25) is a natural protein fiber that reviewers favor for breathability and a premium hand-feel, but it costs far more and needs gentler washing. Synthetic satin (usually polyester) delivers a similar slippery surface for a fraction of the price and is machine-washable, which is why budget satin two-packs dominate retail review volume. If cost and easy care matter most, satin is the pragmatic choice; if you want a natural fiber and don't mind the price and upkeep, mulberry silk is the upgrade.