But it still hasn't entered the market. I also played with very comfortable stretchy shoe uppers. I made shoe prototypes out of white athletic socks with form fitting molded rounded soles. Years later, Nike came out with running shoes that consisted of elastic mesh with light soles, with a minimum of straps to hold them in place. They didn't do well in the running market, and now survive mainly as mesh river shoes.
Hot air rises.
The market was flooded with yogurt makers, so I didn't get very far. Corrugated cardboard construction made of triangles with precise measurements that fold into a segment of a sphere. The triangles were covered with aluminum foil. It could boil water and cook meat. All rights reserved.