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It is very important to protect lips from the sun, so they don`t get blistered, cracked, dry and dark in the summer. My favorite is the Piz Buin! Although more expensive, it has a pleasant flavor, not too thick, don`t let the white lips (with Labello I look dead lol), have 20 protection factor with UVA but makes all the difference! That is not much older and better protected from ultraviolet rays. (The Labello has 30 normal factor). I think that both are resistant to water.
Do you have care of your lips in the summer? What lipstick are you using?
this picture is mine