In recent years, the demand for Nanofront® has expanded in a wide range of fields due to growing needs for materials offering high functionality, such as absorbency and grip, and excellent comfort including soft texture and low skin irritation. Meanwhile, the demand for recycling raw materials is rapidly increasing, but it has been difficult to mass produce ultra-fine fibers made from recycled polyester due to needs for high-level polymer control and spinning. Teijin Frontier has now developed new polymer-control and spinning techniques for Nanofront® made from recycled polyester materials. The key was the company’s proprietary “sea-island” composite-fiber processing technology, which distributes two types of polymers into the fiber’s "sea" and "island" parts, then dissolves and removes the "sea" part using an alkaline, etc. treatment, and finally extracts only the "island" part as raw yarn.