The perfect lip balm is both thin enough to sink into your lips and thick enough to sit on top of them in a protective, watertight layer. In other words, it doesn’t exist — but you can fake it with a little bit of clever layering.
Moisturisers, lotions, and even lip balms keep your skin smooth as the weather gets dry because they prevent water from migrating and evaporating out of your skin. This video from the American Chemical Society shows you exactly how they work.
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