Olaplex 4 In 1 Moisture Mask 370mlA professional only, deeply penetrative mask to restore moisture to dry, dehydrated, or damaged hair of all hair types, especially as an add on after drying chemical services. This mask also helps rebuild disulfide bonds, which play a key role in strand integrity to help hair maintain moisture more effectively. The result is smoother, shinier, more hydrated hair that never feels weighed down. Key Benefits Replenishes dry, dehydrated strands Intensely