Spiral Curls Keratin Extensions are curly hair extensions that are attached with synthetic wax. The real hair has intact cuticles that all face the same direction, providing a natural flow and beautiful shine that lasts over time. The tight S-shaped curls are soft, flexible, and offer a natural look. The attachment is small, discreet, and flexible – ideal for those seeking a long-lasting hair extension that can be styled both loose or in an updo.