System 4 Colored Hair Progressed Thinning Kit by Nioxin for Unisex - 3 Pc 10.1oz Color Safe Cleanser Shampoo, 10.1 oz Color Safe Scalp Therapy Conditioner, 3.38oz Color Safe Scalp and Hair Treatment. This kit helps hair appear thicker while also protecting against damage and breaks. Nioxin System 4 Colored Hair Progressed Thinning Kit nourishes the scalp to prevent hair loss and strengthen strands.