Merrell Men's Chameleon4 Mid Waterproof leather-and-mesh Nubuck Leather Upper - Waterproof membrane treated with Aegis antimicrobial solution provides impermeable but breathable barrier. Moulded EVA - Merrell In-Board Compression Moulded EVA footframe provides supreme cushioning underfoot. Bellows Tongue - Keeps debris out. Insole - 2mm EVA insole for comfort and shock absorption. Stability Arm - External heel and instep stability arm.