Montrail Men's Fairhaven Outdry Road-Trail Running Shoe 100% Synthetic and mesh Synthetic sole Variable Fit System-variable width lacing, with a dynamic welded "seamless" support frame-provides a custom fit and additional medial support Articulated lateral crash zone, constructed out of a resilient EVA foam for durability and cushioning, acco mmodates natural foot biomechanics Multi-surface outsole design combined with a full-length Gryptonite outsole Tetrahedral lug design for multi-directional traction on trail surfaces Deflecting lugs offer cushioning on hard surfaces