Alien Ultra is designed for those who run beyond their limits, transforming every step into forward progress. The outsole works continuously, absorbing and returning energy and guiding movement with precision. Lightweight and responsive, the Pebax + Carbon Plate provides support when needed and freedom when it matters, without compromising control and stability. The Vibram® Megagrip outsole guarantees reliable traction on any terrain. The upper wraps the foot like a second skin: lightness, propulsion, and control to run fast, beyond every limit.