It is intended for people with coarse, unruly or highly textured hair who straighten with a flat iron and want that result to build over time. KMS lists the hair type as straight to coily.

Because it is designed to gradually change how straight the hair becomes with repeated use, it suits someone committed to a smoother, straighter look. It is less appropriate for anyone who wants to keep their natural curl pattern and only straighten occasionally.

Most smoothing products wash out with the next shampoo. This conditioner takes a different approach: its glyoxylic acid and Polysilicone-29 are heat-activated by the straightening iron, so each wash-and-iron session is designed to leave hair a little straighter than the last. For coarse, hard-to-manage hair that is straightened routinely, that gradual build can mean less effort per styling session over time, with conditioning and shine included.

1. Shampoo hair.
2. Apply the conditioner to shampooed hair.
3. Leave in for 2 minutes, then rinse.
4. Once hair is dry, use a straightening iron for the desired straightening effect.

The straightening effect is gradual and builds with regular use in combination with a straightening iron.

Pros:

• Straightening builds gradually with regular use, so the result can be adjusted by frequency.
• Conditions, smooths and adds shine in the same step as the straightening treatment.
• KMS states it protects against heat, humidity and frizz.

Cons:

• Needs a straightening iron to deliver the straightening effect; without heat it acts mainly as a conditioner.
• The effect is semi-permanent and cumulative, so it is not a good fit if you want to keep your curl pattern.
• Contains glyoxylic acid and a silicone-based polymer, which matters if you avoid either.