A new design is emerging in running shoes. The company Enko, is setting the bar high for performance and style. The shoes includes shock absorbers, which are interchangeable, based on your weight. You can buy different sets of springs, depending on whether you are looking for comfort or performance. These awesome pair of running sneakers also come with a set of 6 replacement studs and a key. You can replace the studs individually, according to wear, using the key provided.