NWT Merrell MTL Skyfire 2 size 11 - Merrell trail running shoes. The MTL Skyfire 2 is the lightest and fastest elite trail running shoe Merrell has ever made. Winner of an ISPO award, this elite shoe features our FlexPlate™ to support agility, speed, and provide underfoot protection, this is a first-of-its-kind shoe in the trail running market. The plate sits between two layers of FloatPro Foam™, our most responsive midsole foam for underfoot comfort while the engineered mesh and TPU upper breathes to keep your feet cool. Underfoot, we crafted a custom Vibram® MegaGrip® outsole that minimizes weight while maximizing traction. The MTL Skyfire 2 was built for our elite athletes to blaze up mountain trails.