The discussed option allows for hiding the edges of the hair system. It becomes particularly important while choosing a base made from a thicker material. Hair is woven at the very edge, on the internal side of the base, what ensures more natural look of the entire setup. You may take advantage of the discussed solution at the front or all around the hair system. If you decide to use that option, inform us about it while placing your order and specify where we should apply undervent by providing us with an additional piece of information.