Damaged, weak or over-processed hair that needs a protein boost, such as hair that has been lightened, coloured, relaxed or heat-styled often and feels limp, stretchy or breaks easily. It is sold for home use and is also used in salons before chemical services. Because it is light, it suits fine hair that masks tend to weigh down.

CAT is Redken's quick protein fix. Where the Extreme Mask is a cream that softens and strengthens together, CAT is a fast-absorbing spray aimed squarely at rebuilding strength in hair that has lost it, without leaving weight behind. That makes it the better pick for fine or limp damaged hair, and it can also be used to help prepare hair before colour or lightening services.

• After shampooing with Extreme Shampoo, spray evenly over wet hair.
• Massage through the hair.
• Leave on for 3 to 5 minutes, then rinse thoroughly.
• For best results use 1 to 3 times a week.

Pros:

• Liquid spray reaches all of the hair quickly
• Protein treatment that does not leave hair heavy
• Only 3 to 5 minutes on the hair
• Useful before chemical services to help limit further damage

Cons:

• Too much protein can make some hair feel stiff; stick to 1 to 3 times a week
• Rinse-off, so it should be followed by conditioner for softness
• Contains wheat protein