ENGINEERED MESH: Breathability and support in specific areas where needed. 3D Molded Heel Cup: 2 cushioned inserts provide comfort and lockdown to prevent heel slippage. A new innovative slit in the middle of the heel alleviates pressure on the Achilles tendon. FloatRide Energy Foam: provides lightweight cushioning and a more responsive ride than original Floatride Foam Engineered Mesh Upper: Different structures are engineered in strategic zones for structure and stability where you need it while still maximizing breathability Carbon rubber outsole: for traction and durability where needed