Description 4% MORE FOREFOOT ENERGY RETURN COMPARED TO ULTRABOOST 21 WITH A COMPLETE 360° FEMALE FIT IMPROVEMENT. With the help of 1.2 million foot scans, we updated Ultraboost with a complete 360° female fit improvement. And we didn't stop there. We re-engineered the rubber outsole. We tested hundreds of prototypes. We kept going until we saw visible improvements in performance. The result? 4% more forefoot energy return, compared to Ultraboost 21 for women. The adidas PRIMEKNIT upper includes a narrower heel fit, designed to avoid heel slip and blisters. You'll be riding on a BOOST midsole with a Linear Energy Push system. The shoe's upper is made with yarn containing 50% Parley Ocean Plastic reimagined plastic waste, intercepted on remote islands, beaches, coastal communities and shorelines, preventing it from polluting our ocean. Regular fit Lace closure adidas PRIMEKNIT textile upper Soft heel fit Textile lining BOOST midsole Weight: 10 ounces Stretchweb outsole with Continental Better Rubber Yarn in upper contains at least 50% Parley Ocean Plastic and 50% recycled polyester Imported Product colour: Non Dyed / Non Dyed / Almost Lime Highlights COMFORT TAILORED TO THE FEMALE FOOT Narrower heel fit & lower instep curve for a snug feeling, designed to avoid heel slip and blisters. T3 AWARD WINNER Own your energy with "the best women's running shoes around by a mile" awarded by leading tech magazine, T3.