Responsible Collection: Recycled/Repurposed Upper Material: Matryx (kevlar, nylon) Waterproofing: none Closure: lace Footbed: ETPU Made for elite Merrell athletes, the MTL Long Sky 2 Matryx Trail Running Shoe turns up the performance while trimming ounces off our feet. This evolution of the Long Sky 2 features ventilated mesh uppers made from a blend of Kevlar and nylon for a lightweight build that's nevertheless highly abrasion resistant to protect our feet as we rip through brush and run over rocky trails. The midsoles are made from Merrell's premium FloatPro foam for lightweight cushioning while the outsoles feature the premium wet and dry traction of Vibram Megagrip rubber. It's also a vegan-friendly shoe that's made in part with recycled materials to reduce our environmental impact as we get out there.