ASICS Men's GEL-Aztec MT Running Shoe Synthetic and fabric Rubber sole Water Resistant upper does not lose breathability,Trusstic System reduces the weight of the sole unit while retaining the structural integrity of the shoe Anti Gravel tongue has gussetted construction that prevents debris from entering the shoe, Rearfoot GEL Cushioning System attenuates shock during impact phase and allows for a smooth transition to midstance California Slip Lasting offers stability and comfort Removable Sockliner accommodates medical orthotics, Trail Specific Outsole has reversed lugs thatprovide uphill and downhill traction on all types of terrain DuoMax Support System enhances support and stability, positioned sport specifically