Wella Professionals SP Smoothen, 400 ml, Hair Masks for Women, The Wella Professionals SP Smoothen 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: moisturises intensely makes it easy to comb through and prevents damage restores hair structure How to use: Wash with shampoo, then apply to damp hair.