Spotted: American sustainable footwear startup MUNJOI is on a mission to reduce the amount of shoes we need with their newly launched 4-in-1 All-Dai shoe. 

All-Dai can be worn as a trainer, a backless mule, a sandal slide, or an open-toe trainer. To switch between styles, the insole can be removed and for any components of the shoe to be folded down and tucked away. The insole is then replaced, fixing the new style in place.