Gravity Defyer are a shoes manufacturer that debuted their shoes in the year 2008, featuring a spring as part of the shoe sole to improve impact cushioning. They were first known for their original logo that resembled sperm. The company produces a variety of performance footwear, casual shoes, and formal footwear. https://thefootwears.com/the-ftc-complaint-against-the-gravity-defyer-footwear/