The Altra Men's Impulse Running Shoe delivers a lightweight and stable feel that will help you unleash your natural running instincts. Altra's lightest stability shoe, the Impulse features a Zero Drop platform that encourages a more natural, low impact strike, resulting in properly aligned body posture and strengthened lower leg muscles. Unlike the narrow toe boxes of most running shoes, the Footshape toe box allows room for your toes to spread out, simultaneously improving comfort and balance. The friction free, lightweight, and breathable upper prevents hot spots and keeps you comfy on long distance runs. A responsive EVA and A Bound blend midsole cushions your every step while providing the rebound you need to propel you into your next stride. Varus Stability Wedge Technology provides flexible stability to prevent early and late stage foot collapse, and Stabilipod technology acts as a stabilizing tripod to prevent over pronation. It's finished off with a lightweight FootPod outsole that maps the tendons and bones of your foot to provide a natural, easy flex that won't force your foot to move in uncomfortable ways.