Founded in 2007, Spring Flex offers the world’s most comfortable shoe, featuring a pair of shoes imbued with springs for maximum comfort. Based in Fort Collins, Colorado, with its Engineering Development Laboratory in Knoxville, Tennessee, the company has helped customers all of the country with back pain, joint pain, and foot pain. Their shoe is perfect for workers who are on their feet for long sessions during the day, including restaurant workers, nurses, warehouse workers, and delivery drivers. Similarly, their shoe helps those simply looking for a comfortable shoe to walk around in, be it on a family vacation, a trip to the store, or a shopping spree.