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Like hair extensions, eyelash extensions add length to human eyelashes eyelash. Synthetic single fiber polyester thread-like materials are applied to eyelashes to create a fuller, longer look.^{[citation needed]} Extensions come in various lengths, colors and thicknesses, and can be worn during sleep, showering and swimming.^{[citation needed]} However, excessive exposure to oil can weaken adhesive bond. Eyelash extensions differ from "fake" or "false" eyelashes in that they are applied one extension to one lash. The procedure to attach the extensions takes an average of two hours for a full set of extensions of roughly 30-80 lashes per eye. If properly applied with cyanoacrylate adhesive, eyelash extensions are designed to bond to one's natural eyelash.^{[citation needed]} They look natural and not like strip lashes.^{[citation needed]}

Eyelash extensions may last from three weeks to three months, depending on the cycle of your hair growth. While the artificial lash is placed directly upon the natural lash, they both will fall off naturally as your lashes cycle out and regrow. Most people choose black lashes, however, brown, red, green and purple are available. Colored lashes are good for accents. Mink lashes are available, and are sustainably harvested from live minks in the United States. The minks are combed out, their hair sanitized and the individual hairs are used. Mink sets may cost from $500.00 and up. Most technicians use nylon based hairs, however, not mink. As lashes are placed one upon the other and may never touch the lash next to it, lash extensions are an extremely tedious process for the technician. However, the results should look very natural. Eyelash extensions have been around since the late 1990s, used mostly by fashion models and Hollywood. However, since the early 2000s, many salons have offered this service. Eyebrow extensions are available as well, however are not as popular.

The fake lash never touches the skin, or impedes the growth of the natural lash.