adidas collaborated with renowned chemical company BASF to develop Boost technology, which boasts a remarkable ability to withstand significantly higher temperatures compared to conventional EVA materials. Upon its introduction in 2013, Boost soles quickly gained popularity among runners. Among the four color variations launched by the Three Stripes brand in March 2018, the UltraBoost 4.0 'Ash Grey' version presented runners with a combination of an ultra-breathable Primeknit upper and a cushioned Boost midsole. As a result, wearers can experience unparalleled comfort with each stride taken in these phenomenal runners.