Living proof. Perfect hair Day® heat styling spray provides lasting smoothness and protection. This lightweight, silicone-free styling and finishing spray shields hair from heat up to 450°F/230°C, delivering long-lasting smoothness for up to 48 hours. It can be applied to damp or dry hair before styling with heat tools. The 183 mL (5.5 OZ US) formula ensures hair remains soft and protected without residue.