Your Glo Couture Extensions are custom fit and sits on top of your head, the wire sits about an inch to three inches behind your hairline and the back of the hair extensions slide down just under the occipital bone (bone at the back of your head). To get a secure fit you can play with you Glo Couture unit it feels comfortable and tight but not too tight. Then pull your hair out and over to cover your extensions and the transparent wire. The weight of your own hair will keep it firmly in place. You can move around comfortably without any problem or your extensions coming off.