Etymology: flip flop

Hey all,
Flip flops have been around for at least 6,000 years. The oldest surviving form was made from papyrus leaves about 1,500 BC and are on display in the British Museum. Other sources of flip flops have been wood, yucca plant, palm leaves and and rice straw. They were first introduced to the United States by soldiers coming back from Japan after WWII. However, it wasn't until after the Korean war they became a popular item. They became the symbol for the California lifestyle and a part of surfing culture everywhere. Slowly over time, they grew to the popular and modern flip flop we know today.