PUMA Men's Faas 250 NM Running Shoe 100% Synthetic and mesh Rubber sole Taxi AirMesh upper and PU overlays for comfort and suppor Open-hole mesh lining below the PU layer lends support as well as breathability IdCELL lasting uses KMS-LITE as a strobel lining material that provides improved heel cushioning and decreased weight Built-in flex grooves increase responsiveness while the groove in the heel reinforces stability on impact A moderate rocker shape design allows for a biomechanically-efficient stride with effortless toe-off