Why can a water skater can float on the water surface?

The Gerridae are a family of insects in the order Hemiptera, commonly known as water striders, water bugs, pond skaters, water skippers, water skeeters or jesus bugs.

A water skater is NOT floating, floating means that it is in the water and displacing a volume of water equal to its weight.

A water skater is on top of the water it is not getting wet at all. The reason it can do this is due to the molecular tension of the water surface and to the fact that the skaters legs and feet are hydrophobic (they repel water). These two properties mean that the skater does not break through the surface of the water but "skates" around on the waters surface.