The Opt-In SubHeadline The subheadline simply restates your offer and what they’re specifically getting, such as this: ‘26-page Paleo cookbook including 16 delicious Paleo-friendly recipes you can make in under 20 minutes PLUS beautiful high-resolution pictures’. It should then go on to explain how this will be delivered, and leave nothing to question, such as: ‘Simply enter your email address below and a PDF copy will instantly be sent right to your inbox’.