The length is from 1.6mm to 36mm. The shape of their body is slender and elongate to almost round so they can move very quickly. What all of them in common is they can walk on the water due to the special structure of their leg which wax secreted on and numerous tiny hairs that trap tiny air bubbles that allow the insect to float on the water without getting wet or falling. They barely makes contact with the surface of the water with the tips of its feet which it does make contact, it doesn’t break through the surface. Not only can move freely above the water, but also can pact 15times of its weight without sinking.
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