Skim through

What it does: antistatic, film forming

The science

Polyquaternium-7 is an excellent cationic conditioner. It is especially useful in surfactant based products like shampoos and shower gels.

Benefits for your hair

Promotes softness and shine

This ingredient is great at softening and adding shine to the hair, and providing better and easier slip. It acts as a good detangler too.

Prevents static 

As an anti-static, polyquaternium-7 helps to reduct static and frizz in hair.

TLDR 

Polyquaternium-7 is a great conditioning ingredient, increasing smoothness, shine, frizz, and helping in detangling.