Iles Formula 6.8 oz. Iles Formula Finishing Serum The Iles Formula system was developed by celebrity hairstylist Wendy Iles and a team of scientific experts with the purpose of developing INSTANT repair for ALL hair types. Tested globally across Europe, Africa, Middle East, Asia, India, North and South America delivering excellent results. The Iles Finishing Serum is the hair's best protector against heated tools, UV damage, color fade and humidity. How to Use: Apply to wet hair on each secti.