Hailey Bieber-approved hair mask that gives ‘silky smooth’ results has almost £30 off

The K18 leave-in hair mask is loved by celebrity stylists and A-listers alike for its transformative properties that leave damaged straw-like hair smooth, revived and luscious in just four minutes The K18 leave-in hair mask is loved by celebrity stylists and A-listers alike for its transformative properties that leave damaged straw-like hair smooth, revived and luscious in just four minutes Lifestyle