Featuring high-tech design along with lightweight materials, Nike has created a revolutionary cushioning system with the Nike Shox. The rear features 4 columns of Nike Shox cushioning with thick Phylon forefoot footbed for extremely comfort oriented ride. There is a stitchless midfoot cover that surrounds your foot in comfort. This running shoe is perfect for the runner looking for stability and comfort. If you own an iPod and want to track the vital stats of your run (including calories burned, heart rate, miles traveled) then this shoe is for you. The Nike+ system syncs with your iPod (via separate Nike+ kit) Simply lift the sockliner and place the transmitter (sold separately) in the footbed and run! You can buy the Nike+ Sport Kit at www.nike.com