18" Halo Human Hair Extension by Revlon instantly adds volume and glamour to any hairstyle. Made with 100% human hair, this halo hair extension can be styled however you choose. The base has layered wefting that creates natural movement, and is securely attached using a fine halo and clips. This hair extension is on a halo wire which can be fitted in seconds by putting the extension and wire around the crown of the head and pulling your own hair over the top.