Merrell Skyfire 2. Used a few times. Extremely lightweight and breathable.

The MTL Skyfire 2 is the lightest and fastest elite trail running shoe Merrell has ever made, coming in at 198g. It is built for running at speed across rough terrain. Engineered with BZM-8 rock plate, combined with a two part, dual density FloatPro™ Foam midsole, Vibram® MegaGrip® outsole, an NXT lined EVA footbed, breathable mesh and TPU upper and an elastic lace keeper.