Water shoes are essential for preventing the verruca virus which causes plantar foot warts to feet.
The virus is prominent around the area where people walk barefoot at the swimming pool, gym showers and at water parks. By wearing water outside of the swimming pool and also inside the swimming pool, this reduces the skin to ground to foot contact which is where the virus can be contracted easily.
The photo of the clear water shoes with holes to allow water in and out are the most practical for swimming pools and water parks.
For stronger activity such as beach running or tougher beaches with coral and sharp rocks water shoes should be worn such as the sportier version in the second photo by adidas.