Waterproof membrane seals out water; Pigskin leather and mesh upper; 100% recycled laces and webbing; Bellows tongue keeps out debris; Protective toe cap; 100% recycled mesh lining; Kinetic Fit ADVANCED removable contoured insole with reinforced heel cushioning for medium support; Molded nylon arch shank Boot opening measures approximately 4 around Heel measures approximately 1" Lightweight EVA foam midsole for stability and comfort Vibram TC5+ rubber sole Merrell Air Cushion in the heel absorbs shock and adds stability 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.