Astral X UTMB is where cutting-edge design meets conscious performance. Developed alongside elite athletes, its ultra-lightweight Rilsan frame — a premium eco-sustainable material — delivers exceptional comfort across the longest and most demanding outings. Advanced aerodynamic construction shields against wind and solar rays without adding a gram of unnecessary weight, so nothing distracts you from what matters. Innovation that respects the mountain, built for those who give their best on every trail.