The Altra DUO…. the perfect combination of foot saving maximum cushioning in a lightweight maximum speed package. The durable mesh upper with light TPU overlays coupled with 32 mm of comfy cushion delivers a cushion-to-weight ratio that is hard to beat. The Duo outersole is decoupled to flex and move with your feet. If you love lots of cushion and love to feel light on your feet, the Altra DUO is the shoe for you. Slip on a pair of DUO's today and experience speed to the MAX!