Brooks - Trance NXR (White/Chromoly/Shark/Paprika/Silver) - Women's: The next revolution continues its tradition, offering the ultimate blend of cushioning and stability with more response. Adding Brooks' exclusive e1(tm) and e2(tm) to the most sophisticated midsole combination available makes the NXR the best shoe for the runner with moderate to excessive pronation. HydroFlow ST-XL(R) contains dynamic viscous fluid units for heel and forefoot enhance midsole cushioning. The patented silicon-based system dampens shock at impact, dynamically disperses fluid at impact, and cushions, stabilizes, and rebounds your stride. Forefoot HydroFlow FLX(tm) is a forefoot specific viscous unit that enahces cushioning by dynamically dispersing fluid at forefoot, enhancing cushioning under the metatarsals, and improves flexibility under the smaller met heads. Full length S-257(tm) midsole resists compression, rebounds more quickly than standard EVA and is more durable. Progressive Diagonal Rollbar is biomechanically engineered to allow for progressive pronation control. The multiple durometers of high-density foam at the medial side of the midsole progressively control a runner's tendancy to pronate. Dual Density DRB Accel(tm) enhances tunable torsion of the midfoot. The rigid device is designed to promote natural movement from heel to forefoot. Engineered Hyper-Pod(tm) configuration. Forefoot metatarsal pad offers maximum stability and flexibility that work with bio-mechanical flex grooves. High Performance Rubber, a high-density carbon rubber for increased traction and durability. Microfiber and air mesh upppers. Strobel construction. Shoe weighs 12.7 oz.