Engineered to go the distance during 6+ hour trail runs. With an updated Missiongrip(TM) outsole, redesigned using FEA (Finite Element Analysis) for high performance on technical terrain. Plus Helion(TM) HF hyper foam for powerful energy return. FEATURES: Helion(TM) HF hyper foam dual midsole for high energy return Redesigned Missiongrip(TM) outsole - our most advanced yet Performance engineered using FEA (Finite Element Analysis) Lug geometry for traction and grip on technical terrain Breathable quick-dry Leno weave upper with engineered zoning Engineered rocker to maximize running efficiency Cutting-edge technology for long-distance trail running Built for rugged and mountainous technical trail terrain Most advanced Missiongrip(TM) outsole, redesigned using FEA for optimal performance Midsole: Helion(TM) HF hyper foam for rebound and stability Quick-drying, abrasion-resistant Leno woven upper with breathable and supportive engineered zoning