The Altra Paradigm 3.0 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. This new version features an improved mesh upper with a bunion window for ultimate comfort during the run. Runners will appreciate helpful support just when they need it. Upper: Updated mesh upper with TPU overlay provides breathable flexibility. Padded heel collar enhances comfort. Flat laces reduce irritation. Features an updated bunion window. Midsole: 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. Features a 32mm stack height.