Responsive cushioning in the winterized Pegasus provides an energized ride for wet-weather road running. Experience lighter-weight energy return with dual Air Zoom units and a ReactX foam midsole. Plus, a waterproof GORE-TEX upper and reflective details throughout help you comfortably take on the elements. GORE-TEX Upper - A waterproof GORE-TEX upper and technical mesh help keep water out so your feet stay dry. ReactX Foam - The midsole is made of responsive, supportive ReactX foam, which surrounds forefoot and heel Air Zoom units for an energized ride. Storm-Tread Outsole - The Storm-Tread outsole provides traction in wet weather. Heathered Collar - Heathered material around the collar helps keep your ankle warm. What's New? - ReactX foam midsole is 13% more responsive than previous React technology. [] Product Details - Reflective GORE-TEX logo and Swoosh logo. Reflective graphics and overlays. Not intended for use as Personal Protective Equipment (PPE). Heel-to-toe drop - 10mm. MR-10 Last - Our best, most consistent fit (same as Pegasus 40).