Best heat protectant for flat ironing hair?

Royale hair serum. it works great to repair, protect and moisturize damaged hair, and won't really leave residue. answer mine? a href="http://answers.yahoo.com/question/index;_ylt=ArMXBFmJU.KKjPKtPC9Wl3MazKIX;_ylv=3?qid=20100903173027AAd4Vjo"http://answers.yahoo.com/question/index;…/a