The Women's HOKA Skyward X in black and electric aqua features a 5 mm heel-to-toe drop (46 mm heel/41 mm forefoot). It is a neutral, maximum-cushion road trainer featuring a PEBA foam midsole, a convex carbon fiber plate for suspension, and a stable,, supercritical EVA frame. Key Specs (Women's): Colorway: Black / Electric Aqua Drop: 5 mm Stack Height: 46 mm (Heel) / 41 mm (Forefoot) Weight: 9.2 oz / 261 g Support: Neutral These have only been worn 2x on a Peloton Tread in my home.