this bra extender has 3 rows of position hooks, 3 by 3 hooks enables you to adjust your bras easily. {How to use}: just attach the hooks on the underside of the extender to your bra hook loops, then use the hooks on your bra to attach to the hook loops on the front side of the extender. Use for: Bra extender comfortably increase the band range of your bras. Especially can be used for pregnancy, maternity and weight gain. Extend bra lifetime: this brassiere back extension helps to adjust your new bra and old bra size in case of weight gaining.pregnancy and bra's shrinkage Multiple adaptation: this brassiere extenders have 3 colors.black.skin color and white.can match with your different colors bras. also you can choose the color according to your interests. Extra room for you: the extended bra strap can create some extra room for you.thus to make it comfortable and easy when wearing your bras