Adidas Originals Ultraboost 20 Sneakers. Enjoy comfort and style on tracks, trails and treadmills. These running shoes have a sock-like adidas Primeknit upper. Tailored Fibre Placement provides stitched-in support for a locked-down fit. The Stretchweb with Continental™ Rubber outsole works in harmony with the Boost midsole for flexibility and energy return.