Achieve weightless volume with Olaplex No.4 Fine Bond Maintenance shampoo, an ultralight formula that pairs gentle cleansing with root-lifting support to help strengthen fine hair while removing buildup for a fuller, more refreshed look. Powered by flexible polymers, low molecular weight hyaluronic acid, and a hydra-balancing matrix, it delivers lightweight hydration and lasting body, leaving fine hair soft, manageable, and full of movement.