UNifold by Horatio Yuxin Han. 'UNIFOLD is an experimental project with Professor Crowley that explores ways to construct footwear with a one-piece die cut pattern. Made of EVA material, this design is easily recyclable and could be built without a last.
meggiecat: Bootee Slippers Here's a great sewing project for a long winter's night!
Portuguese site with illustration showing how to draft this neckline using a standard bodice sloper/pattern.