Design: Updated StealthFit flat knit upper offers a blend of stretch and compression that moves with your foot The broad platform stabilizes your foot and promotes smooth heel-to-toe transitions Made with recycled materials equivalent to 7 plastic water bottles In-Shoe Comfort: Additional 2mm of DNA LOFT v3 midsole for a plush ride Super-soft, nitrogen-infused DNA LOFT v3 cushioning is optimized to be lightweight, responsive, and durable for plush comfort Durability & Traction: New RoadTack rubber includes recycled silica and is lightweight and durable Additional Details: Weight: 8.3 oz Midsole Drop: 10mm Brooks Women's Glycerin StealthFit 21 Running Shoes