Merrell Men's Chameleon 4 Mid Ventilator Gore-Tex leather-and-mesh 2mm EVA inSole for comfort and shock absorption Vibram 5mm lug sole provides exceptional traction on varied terrains Breathable mesh lining treated with Aegis antimicrobial solution reduces bacterial buildup that causes odors Pig suede leather and mesh upper for durable, breathable protection from clutter on the trail