The adaptive Primeknit upper, reinforced 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: Weight: 11.8 oz Product measurements were taken using size 9, width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.