The trail running shoe for all conditions - Rain, Snow, and Mud (RSM) included. For this burly mountain shoe, Altra took the super popular Lone Peak 4 design and reworked the uppers with their 100% waterproof eVent fabric. This material both protects your feet from the elements and allows for breathability to keep your shoes well vented. Waterproofing aside, this shoe sports all the awesome features of the Lone Peaks: ultra-light design, just the right amount of midsole cushioning, and the gnarly Trail Claw outsoles for maximum traction on any surface. Don't let unpredictable Eastside weather shutdown another adventure; with the Lone Peak 4 RSMs you can pull through wet, soggy, or snowy sections that would soak other shoes.