Altra Instinct 2.0 - Men's This minimalist running shoe has been upgraded with more responsiveness and flexibility. While keeping the weight of the shoe the same, a touch of cushioning was added to keep feet even happier on long runs. Lightweight, flexible cushioning layer is weight balanced from heel to forefoot to encourage proper low-impact running technique. Innovative foot-shaped toe box allows your foot to relax and spread out naturally and keeps the big toe straight for added stability. The result is a better, healthier run through mile one or 100. Quick Dry Air Mesh upper wicks water away from your foot while remaining light and breathable. Asymmetrical lacing design follows the shape of the foot for improved fit and feel. Heel Claw construction uses a snug fit around the heel for added support. Seamless construction reduces irritation for chafe-free comfort. Drilex collar lining manages moisture to keep your foot dry and comfortable. Removable support insoles are 5mm-thick and designed for runners needing more traditional support and a molded arch. Dual-layer EVA midsole for durable cushioning. Natural Ride System (NRS) design includes a more natural, foot-shaped last. Zero drop platform with full cushioning for extra cushioning where you need it most. FootPod outsole follows the natural construction of the human foot for flexibility and a responsive ride. Stack height: 25mm.