2 Ways to Adjust Size: 1. Place the plastic hook into different notches. 2. Open the micro bead to adjust the wire length. Warm Tips: You can wear 2 pieces halo hair extensions to add more volume to your hair Secure Fit: Imported Korean nylon stretchy wire sit on top of your head which is custom fit to your head. Extra 2 security clips added on either side of the weft will keep the hair extension stay in place and not slip or fall out. PS: You can remove these 2 clips if you dont need them Comfortable Wear: Sit on your head gently wedged on with an invisible transparent nylon wire. They are extremely comfortable in comparison to other types where you can feel the various attachment mechanisms in your hair Easy to Apply: No tape, no glue, no sew, only need to position the halo hair extensions over your hair like a headband, taking less time for instantly thicker and longer hair without extra help in few minutes CANT BE CURLED BY IRON: The hair extensions is made from heat resistance fiber. It can be straightened easily but cant be curled by iron. The factory use special equipment and process to make curls.