The Specter 2 is Topo Athletic's previous-generation speed trainer featuring a Pebax Powered® ATPU supercritical midsole. With a 32mm forefoot/37mm heel (5mm drop) and 230g weight, it delivers outstanding energy return for tempo runs, intervals, and half-marathon racing at a compelling NT$4,600 price point. The Pebax-based foam provides excellent resilience and durability, minimizing energy loss at speed. While a generation old, it remains a high-performing speed shoe—ideal for runners who want supercritical foam propulsion without the flagship price.