Puma Faas 550 : Neutral. Puma's Faas 550 is a minimalist lightweight trainer designed for neutral runners. A bonded TPU cage around the midfoot provides an extra touch of stability so you can go the extra mile. Upper: Bonded TPU cage wraps the midfoot for extra stability. Lightweight synthetic upper with mesh for increased breathability. Padded heel collar and tongue provide increased comfort. Reflective accents increase visibility to others in low light situations. Midsole: Removable, highly breathable antimicrobial OrthoLite® sockliner provides maximum fit and comfort, fast material regeneration and optimized air circulation. idCELL lasting provides increased cushioning. BioRide Construction provides a smooth transition. Innovative Puma midsole material, KMS-LITE, which is 30% lighter than standard Puma-EVA and reduces the overall shoe weight up to 10%. A midsole groove provides natural stability. The rocker shape allows for a centered heel strike and effortless toe-off. Outsole: EVERTRACK, a high abrasion resistant rubber, provides long lasting rubber composite used in outsole areas with strong wear-off. EVERRIDE is a blown EVERTRACK rubber outsole component with high abrasion resistant rubber for extra cushioning and weight saving. Biomechanically placed flex grooves add responsiveness and optimal flexibility. Available in width B (Medium).