Do you struggle with voluminous, unruly, and frizzy hair that expands uncontrollably when exposed to heat and humidity? Traditional oils often fail to subdue heavy volume or coat hair in a greasy, heavy residue that ruins natural movement. Environmental humidity opens up the hair cuticle, causing strands to absorb moisture and puff up. Kérastase Paris Discipline Oléo-Relax Advanced Hair Oil (75ml) provides an ultra-luxurious clinical leave-in treatment. Powered by the Morpho-Huiles Complex, this lightweight hair oil seals outer cuticles against atmospheric humidity for 24 hours, shields fibers from heat styling tools up to 230°C, and delivers an intense glass-like shine with touchable softness and zero heavy residue.