Under Armour Spine RPM Men's Running Shoes The Under Armour Spine RPM Men's Running Shoes are designed to help you train harder and become stronger so you can run farther than ever before. The dynamic motion system is the best yet! It offers a responsive yet lightweight cushioning system that supports you mile after mile. The full-length molded 4D foam sockliner and collar mold and conform to your foot for a personalized and secure fit. Achieve full ground contact with every stride and get the traction you expect from the solid rubber outsole.