Design: Ultra-breathable two-layer sandwich mesh upper Wrap-fit construction is perforated to ensure total comfort FlipRelease™ system makes finding the perfect ft as easy as flipping a switch In-Shoe Comfort: Double layer of Helion™ superfoam works with two layers of CloudTec® to deliver unbeatable cushioning and long-term comfort Durability & Traction: Upper is reinforced with lightweight TPU for durability Missiongrip™ provides the traction you need to master mixed terrain Additional Details: Buying a half size up in this model is recommended Best for: Long trail runs, off-road training on forest trails and gravel roads Total recycled content: about 5% / Polyester: about 20% recycled Weight: 8.64 oz (245 g) Heel-toe drop: 8 mm