The UltraBOOST 20 differs from the original adidas UltraBOOST and the biggest differences can be seen in four key components – the optimised boost, the torsion spring, the Primeknit 360 and the three-dimensional heel stabiliser. Optimised outsole features boost 20% more foam in the midsole compared to the first generation Adidas Ultraboost, this upgraded technology delivers even more energy recovery when running than previous UB models! A new day. A new run. Make it your best. These high-performance shoes feature a foot-hugging knit upper. Stitched-in reinforcement is precisely placed to give you support in the places you need it most. The soft elastane heel delivers a more comfortable fit. Responsive cushioning returns energy to your stride with every footstrike for that I-could-run-forever feeling. Primeknit 360 resembles a second skin, combining pure comfort with lightness and breathability of the material. Last but not least is the three-dimensional heel-shaped stabilizer. The wrap-around design sways the heel, providing the perfect combination of flexibility and support.