Synthetic Rubber sole For over a decade, the Merrell Moab has been the choice of hikers when a choice needs to be made, making it the bestselling hiker in the world. Famous for its out-of-the-box comfort, durability and all-purpose versatility, its predecessors have enabled 20 million people to step further outdoors. Version 3 features a new more supportive insole, a softer more cushioned midsole, a grippier Vibram outsole, and partially recycled fabrics.