A liquid-impregnated surface consists of two distinct layers. The first is a highly textured or porous substrate with features spaced sufficiently close to stably contain the second layer which is an impregnating liquid that fills in the spaces between the features. The liquid must have a surface energy well-matched to the substrate in order to form a stable film. These surfaces bioimitate the carnivorous Venezuelan Pitcher Plant, which uses microscale hairs to create a water slide that causes ants to slip to their death. Slippery surfaces are finding applications in commercial products, anti-fouling surfaces, and biofilm-resistant medical devices. SLIPS type surfaces have a number of advantages over traditional lotus based superhydrophobic surfaces. The free flowing liquid allows for the creation of a smooth surface with the ability to self-repair. This smooth surface often results in a low sliding angle for both high and low surface tension liquids. Finally, SLIPS surfaces can be made optically transparent unlike many traditional superhydrophobic surfaces that scatter light due to having structure on the same order as visible light. LiquiGlide is a commercial example of a liquid-impregnated surface, invented at the Massachusetts Institute of Technology