Heatwave-driven "cooling cosmetics" are booming, with methyl phenyl silicone oils becoming key ingredients in serums and sunscreens. These silicones form breathable films that leverage phase-change cooling for instant 3-5°C skin temperature drops. Shiseido’s research shows adding 5% cyclic silicones boosts sunscreen SPF by 15%. However, dermatologists warn against products claiming "24-hour cooling," which may contain excessive menthol causing irritation. Clean beauty brands now emphasize non-comedogenic dimethicone alternatives.

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