Merrell Men's Portage Web unknown Nubuck, Synthetic leather and Mesh Upper - A soft, stretchy and highly breathable mesh and Clip Closure Locks - Minimal and strong one hand, one-pull tightening lace that secures sh Air Vents - Around the side of the shoes for improve air flow. Lycra neoprene lining - for padded comfort around your foot. Aegis Microbe Shield - Protects against odour causing organisms keeping your feet cleaner