Note: this item is limited to one pair per customer/address/order. The popular Ultra Boost is a light and comfortable running shoe, which also gives you the best possible condition when you are running. The shoe is made with a Primeknit upper, which gives you maximum breathability, while also adjusting itself to your foot for a more comfortable fit. The adidas Ultra Boost is equipped with adidas' revolutionizing Boost midsole, designed to ensure an efficient energy transfer with every step you take. The Boost technology is created with small polyurethane "capsules", that are moulded together in the sole. They work by absorbing the energy from the shock absorption that you generate, and afterwards convert it to energy in your steps and gives you great momentum. Furthermore the shoe is designed with the TORSION SYSTEM that offer stability around the midfoot, and helps keep the feet level. FITFRAME 3D shaped heelcap from TPU offers stability around the heel.