Muck Footwear Men MUCKMASTER HI BLACK BIG Apex is built with an These work boots feature Apex is built with an innovative construction for high endurance treks that require a more athletic and agile boot while still providing comfort and waterproof protection The new Vibram Arctic Grip All Terrain outsole with Vibram XS Trek Evo compound and New Traction Lug Technology provides advanced traction on all terrains including wet ice The classic Muck Boot neoprene adjusts to the unique contours of your foot and the mesh lining lets your feet breathe MS1 bobbed molded outsole reduces weight and improves stability for climbing and trekking