Why do my fingers absorb water and become wrinkled?
Human finger tips do not become wrinkled because they absorb water. Skin is a fairly good barrier that keeps out most of the external water. If our fingers did absorb a significant amount of water after staying in the pool or bath for several minutes, then our fingers would swell to round, plump shapes, which is the opposite of wrinkling. The wrinkling is actually caused by a reduction of fluid inside the finger tips.