Nike Shox R4 line is so cool and fashion. The upper of the Men’s Nike Shox R4 features synthetic leather, and the midsole is lightweight Phylon that includes the now famous Shox columns, which produced from a unique, highly resilience formula, to promote ultimate stability.Nike Shox R4 is one of the most popular and most successful running shoes.New, high tech, high durability materials make the leaf spring obsolete and bring about the current form for Nike Shox shoes R4 Shoes: four cushioning columns between two resilient plates.