The updated Altra Lone Peak 4 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 100% waterproof and offers market leading breathability, delivering maximum comfort and protection in the widest range of conditions. In addition, the Lone Peak 4 RSM features a reinforced toe cap, modernized mountain design on the upper and 4-Point GaiterTrap technology. The updated gnarly Duratread, multi-directional outsole features accentuated TrailClaw for optimum grip and traction where you need it most.