Worn just twice for a total of 13 miles - EXCELLENT, LIKE NEW. The bottoms feel like a dream. Incredibly comfortable but I need more stability in my heels (old injury). From the Hoka website: A propulsive speed-training partner. Bolder than ever before, the Mach X 2 brings the heat to speedwork. Inspired by the Cielo X1’s race-ready geometry, we combined an extra-resilient PEBA-topped midsole and increased rocker profile for an aggressive toe-off, then extended the Pebax® plate design for enhanced support and propulsion. With an extra-breathable and supportive woven upper and a sleeker collar, this speed trainer keeps things light, cool, and fast for next-level efforts. BEST FOR: Everyday Run FEATURES: Sleek, race-inspired collar Gusseted tongue Lightweight, breathable woven upper Reflective detailing for visibility Highly resilient PEBA foam