Designed for performance on mid-to-long-distance trail runs. A Flextron® PRO propulsion plate delivers powerful energy return and dynamic forefoot flex while providing just the right amount of torsional stability. The dual-density foam combines lightweight Mammut CORE Ultra foam with Mammut CORE Plus foam, offering excellent rebound for enhanced comfort and responsiveness, along with outstanding cushioning – whether running 10k or over 30k. Built for endurance, the durable, reinforced design of the Aenergy Trail Endurance Ultra Low shoes lets you handle any trail, be it straight from your backdoor or high up in the alpine.