PUMA Faas 100 R Running Shoes Mesh Upper - Minimal and highly breathable single-layer mesh upper sandwiched between bonded overlays for protection. High Rebound OrthoLite Sockliner - Provides higher responsiveness and step-in comfort through the gait cycle while featuring improved air circulation with antimicrobial properties. Internal Suede Forefoot Support Structure - Ensuring an extremely lightweight one-piece upper. Gusseted Tongue - For a secure fit. FAAS Foam+ - PUMA's new proprietary blend of foam and rubber, which is more resilient, has increased step-in comfort and a springier feel - and is 25% lighter.