altra women's lone peak 4.0 (10 b us) green/grey altra the lone peak 4.0 mid rsm features a 4-point gaitertrap to keep dirt, dust, sand and debris out as you tackle mile after mile of your chosen trail. enjoy the enhanced breathability of a mesh hiker with the same comfort and design as the neoshell mid, and with altra's signature footshape toe box and fully cushioned zerodrop platform you can continue to hike comfortably and balanced.