The project Gaspard Tiné-Berès and Ruben Valensi want to bring to production is called "Lasso".
These will be produced in Paris, France.
The best is probably to let them describe their idea:
"Lasso is a pair of flat-packed slippers. Made from one piece of wool-felt with a leather sole and laced in the color of your choice.
The flat pattern is shaped simply by sewing the provided lace through the corresponding pre-cut holes. They are delivered flat-packed with laces of your choice and only take a few minutes to assemble."