Nexxus Y Serum Restorative Conditioner is a nutrient rich and ultra replenishing conditioner that works to detangle and boost hair to leave it looking and feeling replenished. The lightweight formula of this rinse out Nexxus Y-Serum Restorative Conditioner detangles and reduces surface tension to prevent damage to the cuticle. Its ultra caring formula also works to lock-in hair color and provide UV and thermal protection.