The "by one sii Smooth Repair Essence" is a hair care booster that adds body and resilience to hair when mixed with shampoo. It was released on January 20, 2021, with a capacity of 290g and a regular price of 5,680 yen (including tax). Key Features: Contains mineral-rich volcanic rock (Iou-seki): The porous volcanic rock accurately adsorbs peroxidized sebum, removing the causes of hair damage. Contains 40 botanical ingredients: Cornflower flower extract, Coix lacryma-jobi seed extract, and others hydrate the hair and scalp, keeping them healthy. How to use: Mix an appropriate amount with your usual shampoo, lather, apply to the entire hair, and then rinse.