De Lyle “Retro” Hair Serum De Lyle “Retro” Hair Serum is a unique blend designed to deeply nourish your hair, giving it a natural shine and noticeable volume — all wrapped in a soft, feminine fragrance that takes you back to the elegance of the 1960s. Enriched with Argan Oil, it provides intense hydration, strengthens the hair, and protects it from breakage and split ends, promoting healthier, longer-looking hair.