Answer - Keratin
Your skin is made of keratin which absorbs lots of water. Fingers and toes have the thickest skin on your body and absorbs even more water while what lies under your skin does not - it works like a gathered skirt.
Your nails are also made of keratin. This is why your nails are soft and pliable after being in water.
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My daughter spent the afternoon at a water-themed birthday party this afternoon. Here was my inspiration for this article.

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