Merrell's lightest and fastest trail running shoe Thermoplastic mesh uppers reduce weight Vibram Megagrip provides wet and dry traction Cleansport NTX adds odor protection 6mm drop moderates our stride The MTL Skyfire 2 Matryx Trail Running Shoe is Merrell's lightest and fastest trail runner. This top-of-the-line shoe features two layers of FloatPro Foam for cushioning which surround a stiffer FlexPlate for added speed and foot protection as we negotiate rocks and roots. The Vibram rubber outsoles offer deeper, 5mm lugs for more bite when we're running off road. Made for race day or faster runs, the Skyfire 2 Matryx keeps our weight low and performance high.