Rubber sole Not intended for use as Personal Protective Equipment (PPE) Rubber outsole adds traction and durability. Flex grooves on the midsole let you move freely. Koi details celebrate the fish of prosperity and good fortune. Good fortune is coming your way. The tried-and-true icon from the '90s now dips your feet in the pond of prosperity. Koi details throughout (including a subtle scale print) pair with a Koi graphic on the sockliner for a meditative look. The wavy side panels add water-like flow, while visible Nike Air cushioning delivers performance comfort. Go ahead and take your chance.