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 hairSecure 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 don't need themComfortable 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 hairEasy 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 minutesTangled Hair - UNLIKE the human hair, the synthetic hair fiber may get tangled after 2-3 wears because the synthetic fiber will build up static. To detangle the knotted hair, please fill some conditioner with water in a spray bottle, spray it in the hair extensions, then use a wide tooth comb to brush it from END to ROOTMaterial - Heat Resistant Fiber is able to resist the heat from styling tools to give you almost the same styling versatility as human hair (optimal temperature is 250-275 degrees). Going above 350 degrees is not recommended. The hair extensions is easy to be straightened but not easy to make big curls because the factory use special equipment and process