When the adidas Ultraboost debuted in 2015, it set the standard for comfort and performance in a running shoe. Each new release raises the bar, and this one is no exception. These running shoes are built for cold-weather runs, featuring COLD.RDY to keep feet warm. The energy-returning BOOST midsole is reflective, so it shines bright from dusk to dawn. The Continental Wintergrip Rubber outsole ensures a secure grip on slick streets. Regular fit. Lace closure. adidas PRIMEKNIT textile upper. COLD.RDY. Linear Energy Push system. Reflective BOOST midsole.