When theadidas 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 designed for cold weather running, with COLD.RDY technology to keep feet warm. The BOOST energy-returning midsole is reflective, so you can shine brightly from dusk to dawn. The Continental Wintergrip Rubber outsole provides secure grip on slippery streets.Regular fit.