Newton Running Women's Kismet Blue/White Mesh^Synthetic Engineered mesh upper - Provides lightweight breathability and structure in key areas. Synthetic Overlays - Are anatomically placed to provide a secure fit. ETC Sockliner - Is anti-bacterial for underfoot comfort and a healthy foot environment. Strobel Last with the upper stitched to full length fabric - For a comfortable underfoot feel. Action/Reaction Technology - These external lugs compress to absorb shock energy, and then release energy during toe-off.