Which of these products was originally developed for WWII fighter pilots before becoming a mainstream retail success with billions in annual sales?

Throughout history, military requirements have driven the development of products that later transformed civilian life. From radar to the internet, military R&D has produced innovations that eventually reached consumer markets. This poll explores one such military product development case study that revolutionized both warfare and civilian industries. Test your knowledge about how military necessity led to commercial innovation!

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Polarized sunglasses, developed to reduce glare for pilots flying over water and clouds
Memory foam mattresses, designed to absorb g-forces during high-speed aerial maneuvers
Thermal imaging cameras, created to detect enemy aircraft during nighttime operations
Waterproof watches, engineered for synchronized amphibious landing operations