Kevin Murphy Body Mass is a leave-in hair treatment designed to add thickness and volume to fine, fragile, or thinning hair. Its nutrient-rich formula helps to fortify the hair shaft from the roots to the ends, promoting stronger and healthier-looking hair with every application. Ideal for daily use, this lightweight treatment improves hair density and texture. Simply apply to damp or towel-dried hair at the roots and through the lengths, then style as desired for full-bodied results.