Montrail Nitrus - Montrail Men's Running Shoes : Ideal for the high-mileage trail runner with sensitive feet. ; Flexible conforming upper expands to accommodate wider feet. ; A cushioning four-density midsole plus TerraHex cushioning and shear control system. ; Airmesh windows enhance airflow to keep you feet cool and comfortable. ; Trail-stable performance. ; Medial posting with a TerraHex cushion platform. ; TerraFlex protection and control. ; Stretch gusset keeps out rocks, dirt, and other debris. ; Gryptonite GT rubber outsole and aggressively lugged treads have sticky, long-wearing traction. ; Weight: 13 oz (0.37 kg). ; TerraFlex: ; TerraFlex is a three component system combining a high-traction outsole, a protection plate and a shock-absorbing midsole. ; This design allows extremely lightweight shoes to provide traction, protection, and cushioning.. Product Type: Montrail Men's Running Shoes. - Flat rate shipping $6.95