The Melissa One By One is a flat made of PVC and has no side so that you can wear on either right or left foot, therefore, needs only one injection mold. Each foot is sold separately that allow the user to buy a pair, 3, 5, 7 till 9 flat different combinations that can create pairs, one different from other. Most likely, it is possible to offer the user the freedom to do their only combinations, buying how many prints they want. Additionally, at each new launch, the user will be able to take only one combination that likes most, creating an unique color and print colection becoming a collectable product.