From Side Hustle to $1M in Sales | Side Hustle Nation Blog

Mike Ettenberg spent 10 years as a firefighter, but was constantly losing or breaking his sunglasses on calls.

Frustrated, he decided to take matters into his own hands.

Frontline Optics makes durable sunglasses for first responders with a no-questions-asked replacement policy.

Despite having "no business experience," the Side Hustle Show listener took Frontline from side hustle to full-time venture, selling over $1M worth of sunglasses along the way.