PUMA Faas 600 V2 F4, Men's Running Shoes EVERFIT - Cinches the midfoot and delivers a secure, adaptive lockdown. AirMesh Upper - Permits air into the upper to encourage an environment that is cooler, drier and fresher. EcoOrthoLite Sockliner - Works with the aforementioned AirMesh material to improve comfort and material regeneration whilst eradicating odour carrying bacteria before it has a chance to spread. Reflective Overlays - Reinforce the upper and suffuse it with a luminous quality that preserves the wearer's visibility in poor light. neutralCELL - This proprietary cushioning technology accommodates smooth ride and efficient gait.