Montrail Men's Trans Alps mesh Full length FluidFoam Midsole - Soft, responsive cushioning from heel to toe. Patented FluidGuide Midsole Technology - Offers enhanced midfoot stability on uneven surfaces and a smooth ride on the trail. Full Length TrailShield Technology - Lightweight, flexible material that is co-molded between outsole and midsole for underfoot protection from rocks, roots, and other trail debris. Seamless Upper Construction - For comfort throughout the strike. Thermoplastic Reinforcement - Creates inherent stability throughout the midfoot