Clinical tests have shown that this weightless volumizing conditioner for fine hair strengthens, repairs, and prevents damage from everyday stress factors, styling, or other treatments.* The best conditioner for fine hair can provide both volume and strength. N°5 5FINE hydrates, nourishes, and perfectly detangles fine hair, leaving it smooth and strong without weighing it down, for volume that lasts all day. *When used in conjunction with N° 4FINE Bond Maintenance® shampoo.