altra women's lone peak 4.0 (9 b us) black altra if you fell in love with the first version of the mid you are going to love the updated one. the lone peak 4 mid mesh is even more durable and ready for mile after mile with a heavy (40+ lb) pack. the lone peak 4 mid mesh features a 4-point gaitertrap to keep dirt, dust, sand and debris out as you tackle mile after mile of any terrain. the revamped outsole features multi-directional lugs and decoupled trailclaws for increased traction and decreased weight. you will also enjoy the enhanced breathability of the updated mesh with the same comfort and fit4her design as before.