The VOIR "Rhythm of the Rain" Calming Glacial Leave-In Scalp Serum is a new product that aims to provide soothing and nourishment for the scalp. This serum, made by the brand VOIR, is designed to be used as a leave-in treatment to help maintain a healthy scalp. With its calming and glacial formula, it may help to reduce scalp irritation and promote a relaxing scalp sensation. Perfect for those looking to pamper their scalp and provide it with some extra care and hydration.