People who flat iron or curl with hot tools regularly and want protection applied right at the ironing stage, on dry hair. It suits most hair types; AG customers with fine hair and with frizz-prone hair both report using it.

It's a retail product that works equally well at home or behind the chair, and it's a natural follow-up to a smoothing blow-dry lotion such as AG Set It Straight.

Many heat protectants are made for damp hair before a blow-dry. Firewall is made for the flat iron: it goes on dry hair right before the plates, it's rated to a typical iron temperature of 218°C / 425°F, and its silicone and argan oil slip helps the iron pass through without tugging. The same can then works as a shine spray once you're done, so one product covers the iron step and the finish.

• Start with dry hair and divide it into sections.
• Mist lightly over each section.
• Flat iron or curl as usual.
• For extra shine, mist lightly over the finished style.

Pros:

• Rated for flat-iron temperatures, up to 218°C / 425°F
• Applied to dry hair right before ironing, so no waiting for it to dry
• Silicone and argan blend helps the plates glide and leaves a visible shine
• Works as a pre-heat protectant and a finishing spray

Cons:

• Aerosol with flammable propellants; keep the can away from heat and flame
• Too much on fine or oily hair can look greasy; a light mist is enough
• Fragranced, with several listed fragrance allergens (limonene, linalool, geraniol, citronellol, eugenol)