Merrell Men's Bare Access 4 Trail Running Shoe 100% Mesh/Thermoplastic Polyurethane Imported Vibram sole Low-profile trail runners featuring mesh uppers with gradient synthetic side overlays 0mm heel-to-toe differential M BOUND energy-returning midsole Reflective details for increased visibility in low light Breathable mesh lining Sticky Vibram outsole with 2mm lug depth