Paul Mitchell describes this weekly mask as suited to dry, damaged and color-treated hair, and lists it as color safe. That covers hair that feels rough or brittle from heat styling, lightening or color, and hair that has lost softness and shine.

It is a rinse-out treatment used about once a week, so it suits anyone willing to add a 3 to 5 minute step to an existing wash routine. It is not a daily conditioner, and no special technique is needed.

The distinguishing feature is the KeraTriplex system: three keratin forms combined with awapuhi extract, so the formula pairs protein for rebuilding damaged strands with a moisture component in one mask. Rather than a light daily conditioner, it is a heavier weekly treatment for hair that needs more than a rinse-and-go product.

It also comes in a 16.9 fl. oz. size, which makes sense for anyone applying it regularly to longer or thicker hair.

Paul Mitchell's directions: use weekly.

1. Apply a small amount to clean, damp hair.
2. Leave on for 3 to 5 minutes.
3. Rinse thoroughly.

For a deeper treatment, wrap hair in a warm towel or apply heat while the mask is on.

What works in its favour

• Three forms of keratin (keratin, hydrolyzed keratin, oxidized keratin) plus wheat amino acids give it a protein-focused repair angle for damaged hair.
• Brand-stated color safe, so it can be used on color-treated hair.
• Short leave-on time (3 to 5 minutes) and optional heat for a deeper treatment.

Things to weigh

• Contains silicones (amodimethicone, dimethicone), which people avoiding silicone build-up may not want.
• Fragranced and preserved with methylisothiazolinone/methylchloroisothiazolinone, so those with fragrance or preservative sensitivities should check the ingredients first.
• Intended weekly, so it does not replace a regular conditioner.