Merrell Women's MTL Long Sky 2 Matryx SneakersPush yourself to achieve more in the MTL Long Sky 2 Matryx Breathable, abrasion resistant, and lightweight Matryx upper combines multi filament threads of Kevlar and high tenacity polyamide to create a single layer of material High rebounding ETPU foam footbed Energy returning FloatPro foam midsole High performance Vibram MegaGrip rubber outsole for grippy traction on both wet and dry surfaces 37. 5 temperature regulating mesh footbed cover and tongue