There's more to the Electron E Trainers than meets the eye. Its visible technology highlights fantastic features like a breathable mesh upper, synthetic quarter panels for support and a bold aesthetic that's both fun and futuristic. The elastic band on the heel provides extra comfort. IMEVA: PUMA's material for a lightweight and comfortable feel. SoftFoam : PUMA's comfort sockliner for instant step-in and long-lasting comfort that provides soft cushioning every step of your day.