3 doctors weighed in:
How are humans waterproof?
3 doctors weighed in

Dr. Michael Fisher
Dermatology
2 doctors agree
In brief: Waterproof skin
The outer layer of skin (epidermis) contains a tough, water resistant protein called keratin.
As well as a greasy sebum, secreted by sebaceous glands, has an anti-microbial effect, as does the wax secreted by the skin lining the outer ear cavity.

In brief: Waterproof skin
The outer layer of skin (epidermis) contains a tough, water resistant protein called keratin.
As well as a greasy sebum, secreted by sebaceous glands, has an anti-microbial effect, as does the wax secreted by the skin lining the outer ear cavity.
Dr. Michael Fisher
Dr. Michael Fisher
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