In one configuration of the present invention, a hair extension device for providing a user with the appearance of having longer, fuller hair is disclosed. The device may have a hair cluster having a hair flap which in turn comprises one or more hair wefts. The hair wefts may contain a number of hair strands connected together by seams which composes the band. The device may contain a filament which may be sandwiched between one or more flaps. The hair wefts may be sewn together with thread using a zigzag stitch for example. The hair extension device may be reversible and it may comprise lace and a tension band.