The adaptive Primeknit upper, reinforced tailored fiber stitching around the toe, and the responsive boost midsole make the adidas Running Ultraboost 20 running shoes one of the most comfortable additions to your stride. Predecessor: Ultraboost 19. Support Type: Neutral. Cushioning: Lightweight, flexible response. Surface: Road. Differential: 10mm. Lace-up closure. Structurally-supportive synthetic mid-foot cage. FITCOUNTER molded heel counter offers a natural fit that allows optimal movement of the Achilles tendon. Smooth textile lining with a removable foam insole. Ultracushioned boost midsole is optimized for a responsive ride that helps return energy. TORSION SYSTEM, placed between the heel and forefoot, helps promote a more stable ride. Continental rubber outsole delivers reliable grip over wet and dry surfaces. STRETCHWEB rubber in the outsole flexes for increased energy underfoot. Imported. Measurements: Heel Height: 23 1 5 in Product measurements were taken using size 8, width B - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.