At the core of every great idea is a spark of inspiration. That spark? The feeling of effortless running. The idea? Make it happen every time you hit the pavement. The responsive Boost cushioning returns energy endlessly over the miles, and a sock-like adidas Primeknit upper provides breathability and support where you need it. Brand new in box. Price is firm. Unisex shoe. Box lists men’s size. Listing converted to women’s sizing.