Inspired by yu-su-ru, an ancient Japanese bathing ritual, the Shu Uemura Izumi Tonic Strengthening Conditioner is a lightweight, fluid formula that lends rich hydration to lacklustre lengths.Powered by tonic water from the Japanese Izumi, the conditioner helps to smooth down hair cuticles to impart a natural-looking radiance to strands, while boosting hair manageability. Hair appears weightlessly smooth and glossy when using the full Izumi Tonic routine.