This is hair that has tracks sewn at the top and clips (above) are sewn onto the wefts. These are for customers that like to put on and take off hair extensions quickly and easily. Typically, customers will remove the hair when they shower or going to bed. These are usually sold in different clip on sets whereby there are various size clip on sets (2 clips, 3 clips, 4 clips). As noted above, many customers will purchase wefts and sew the clips onto the hair itself to use as clip on hair. This hair may also be referred to by a number of names including instant hair extensions, clip human hair extensions, human hair pieces, clip extensions, clip hair extentions, clip on hair, clip human hair, clip on extensions, clip on hair pieces or clip hair pieces.