Structural Strengthening Foam Result: Stability and strength. Target Group: For weak hair. Product: Hair is up to 10 times more sensitive to damage when it is wet. When exposed to heat the hair needs protection against heat and mechanical damage during blow-dry. System Professional Perfect Hair provides hair with volume and improves its structure. The leave-in foam deeply strengthens the hair fiber. Hydrolised keratin and amino acids penetrate the porous zones of the hair structure and restructures damaged areas. The protective polymers of the Thermo-Resist formula make the hair more resistant against the effects of heat for strong and resilient hair. Application: Do not shake the bottle. Apply 2 to 6 pumps into the hair before blow drying, comb through then blow dry. Do not rinse out.