The Altra Paradigm 2.0 is the new installment from this maximum cushioning line. Neutral runners will continue to benefit from the Zero Drop™ of this shoe as well as a lightweight, but hard-working cushioning system. A wider, more accommodating toe box promotes toe splay for an even and more natural foot pattern during the run. This shoe helps promote fast, responsive running with efficient foot movement and form. This shoes is ideal for road running, trail running, ultramarathons or walking. Upper: Quick-Dry Air Mesh provides breathable flexibility. Padded heel collar enhances comfort. Flat laces reduce irritation. Increased reflectivity and upper durability in this new design. Midsole: FootShape™ allows toes to relax and spread out naturally and the big toe to remain in a straight position for more comfort, speed and stability. A-Bound™ super lightweight EVA Foam combines with an energy-return compound protects the feet at impact and adds a spring to reach step. Zero Drop™ places the heel and forefoot the same distance from the ground to encourage natural, low-impact running form. Removable insole.Outsole: Foot Pod Technology™ maps the bones and tendons of the foot to let it flex where it naturally wants to.