PUMA Men's Faas 500 v4 PWRWARM Running Shoes Synthetic NeutralCELL - To increase the flexibility and comfort. Night Cat - Ensures you stay safe and seen in low light conditions. EVERFIT 2.0 - Improved upper lockdown technology. OrthoLite - Moulder sockliner for step in comfort. FAAS Foam+ - Provides the springer feel.