TR BUILD A BOND MASK 9.5OZ. Benefits: 1 billion bonds in every bottle to fight damage. Repairs damage and strengthens hair from within. Deeply nourishes without weighing hair down. Softens and smooths hair. Provides 8x stronger and 94% smoother hair* (*System of Instacure Build-A-Bond Shampoo, Conditioner, Mask & Balm vs non-conditioning shampoo). Features: Professional mask for mega damaged hair. Innovative liquid texture. Suitable for color-treated and highlighted hair. Free from sulfates, parabens and mineral oil. Key Ingredients: Citric acid penetrates deep into the hair fiber to strengthen and reinforce damaged strands from within. Squalane works on the hair's surface, softening and smoothing each strand for a silky finish.