Biolage Essentials SmoothProof, 100 ml, Hair Masks for Women, The Biolage Essentials SmoothProof hair mask is an essential step in your hair care ritual. Give it a moment to regenerate and it will repay you with vitality and beauty. Characteristics: regenerates the hair along its entire length gives hair a brilliant shine improves the elasticity of hair fibres makes hair smell beautiful strengthens the hair fibre restores hair structure How to use: Wash with shampoo, then apply to damp hair. Leave to act as instructed on the packaging, then rinse thoroughly.