Answer: flexible manufacturing
Explanation: Flexible manufacturing is the type of manufacturing system employed at NikelD, wherein customers through customization can design their own athletic shoes. As such, there is usually equipment and computerized systems configured to manufacture a variety of parts and handling changing levels of production. Doing this serves to improve efficiency while lowering the company's production costs significantly and is a characteristic feature of make-to-order strategies requiring a high degree of customization by customers. This system of manufacturing also creates a method of production designed to adapt to changes in the type and quantity of the product being manufactured very easily.