The epidermis (skin) is typically ten to thirty cells thick; its main function being to provide a waterproof layer.

For example a non-breathable waterproof layer will make ineffective the performance of good base and mid-layers.

Land plants maintain adequate tissue hydration by means of an outer waterproof layer.

Keeping dry is critical, so a strong, waterproof outer layer is essential.

Wear waterproof outer layers to keep you dry.

Butter and margarine act as a waterproof layer for bread against wet foods like sliced tomato.

The epidermis is typically 10 to 30 cells thick; its main function is to provide a waterproof layer.

A strong, waterproof outer layer (and a space blanket for emergencies) is essential.

Whether you're in cycling kit or ordinary clothes, if you must have a waterproof layer just get a simple gore-tex shell.

The bark is also used to create a durable waterproof layer in the construction of sod-roofed houses.