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Functional / Support

Polyisobutene

Often labeled as: Waterproofing Polymer

The heavy-duty, water-resistant film former.

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Overall Safety Safe
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Pregnancy Safety Safe
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Comedogenic (0-5) 1 / 5
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Irritancy (0-5) 0 / 5

๐Ÿ”ฌ How It Actually Works

A synthetic hydrocarbon polymer. It creates a highly tenacious, completely water-resistant film on the skin, making it an essential ingredient for sports sunscreens and long-wear makeup.

๐Ÿ’– Why your skin loves it

Ensures products do not sweat off, locks in moisture, and thickens formulas.

๐Ÿ’ก Pro Tip

Can feel slightly tacky until it sets completely.

โš–๏ธ Myth vs. Fact

The Myth

It suffocates the skin.

The Science

It forms a flexible, breathable lattice that protects without occluding oxygen.

๐Ÿงด Formulations featuring Polyisobutene