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Klairs sunscreen is a daytime UV step, not a night cream and not a vitamin serum. US shoppers landing here usually want a Korean-style fluid or cream that sits under makeup, with a clear SPF number on the carton and a finish that does not leave a chalky cast on deeper skin tones.
Sunscreen is the last skincare layer in the morning; moisturizer and serum go underneath. Read reapply notes, volume, and whether the tube is a fluid or a cream. Choose the Klairs sunscreen whose finish matches how you wear makeup, then add it as its own listing rather than substituting a moisturizer.