Protect your hair from heat damage and frizz with a keratin spray. | Heat spray TRESemmé Keratin Smooth has a 5-in-1 action with a moisturizing effect. It prevents damage to hair fibers during straightening or curling, prevents flyaways, and protects against frizz for up to 72 hours. It makes hair easier to comb, increases shine, and leaves it soft to the touch.