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The updated Altra M Lone Peak 4 mid RSM is ready for any weather you choose to run through. As its name suggests, this member of the Altra All-Weather Series (AWS), is ready for Rain, Snow, and Mud (RSM). The upper is made of eVent®. eVent® is Weather Resistant and offers market leading breathability, delivering maximum comfort and protection in the widest range of conditions. In addition, the M Lone Peak 4 mid RSM features a reinforced toe cap, modernized mountain design on the upper and 4-Point GaiterTrap™ technology. The updated gnarly MaxTrac™, multi-directional outsole features accentuated TrailClaw™ for optimum grip and traction where you need it most.