Upper Material: engineered mesh, TPU overlays Waterproofing: none Lining: microfiber Closure: lace Footbed: 100% recycled mesh cover Light and fast, the Merrell MTL Skyfire 2 Matryx Trail Running Shoe helps us move quickly through mountains, deserts, and forests. These low-profile trail runners boast a breathable engineered mesh upper reinforced with TPU overlays that wrap around our foot securely via recycled laces. This breathable and durable upper wicks sweat off of our feet so that we can rely on the stability of the FlexPlate technology and the response of the FloatPro dual density midsole. Finally, the Vibram MegaGrip outsole effortlessly grips everything from sand to loam to help us stay focused on our pace, route, or final destination.