Paul Mitchell Color Protect Locking Spray is a non-aerosol, no-rinse leave-in spray made for color-treated hair, built around cinnamidopropyltrimonium chloride and sunflower extract to absorb the UV rays that fade hair color faster than they fade natural pigment. Sprayed onto clean, damp hair and combed through, it's meant to sit on the hair between washes as a buffer against sun exposure rather than act as a one-time treatment.
The formula also carries jojoba oil, aloe, rosemary and chamomile extracts for slip and shine, alongside conditioning agents and a DMDM hydantoin-based preservative system. It's fragranced, so anyone with fragrance sensitivities should patch-test before regular use. Because it's targeted specifically at slowing color fade, it offers little extra benefit on hair that isn't color-treated, and it works best as one piece of a broader color-care routine rather than a standalone fix.