About National Flip Flop Day
The American restaurant chain, Tropical Smoothie Cafe, created National Flip Flop Day in 2007, in honor of their 10th anniversary, and to show appreciation for their guests and to kick off summer.
The term flip-flop has been used in American and British English since the 1960s to describe the thong or no-heel-strap sandal. It is an onomatopoeia of the sound made by the sandals when walking in them.
Flip-flops date back thousands of years, even making an appearance in ancient Egyptian murals from 4,000 BC.
Flip-flops first become popular in America when soldiers came home from World War II with Japanese zori.” They became increasingly popular by the 1950s and were being mass-produced throughout the United States.