The Ultraboost 20 features 20 percent more boost than regular boost sneakers, and coupled with the superb Primeknit upper makes it an extremely comfortable ride. You want a casual and sporty The women’s version of Adidas Ultra boost is a bit heavier than Asics Gel-Kayano. For women, Adidas Ultra boost weighs around 10.9oz or 309g whereas Asics Gel Kayano weighs around 9.1oz or 258g. For men, both the shoes weigh the same. There are more sizes available in Asics Gel Kayano than Adidas Ultra boost. The latest generation of Asics Adidas Ultraboost shoes are a type of running shoe that is designed to provide a comfortable, responsive ride. They have a boost™ midsole that provides energy return, and a stretchy upper that hugs your foot for a snug fit. The outsole is made of Continental™ rubber for durable traction. In cold weather, it is lighter and more durable than Adidas says that the Ultraboost 21 is 15% stiffer than the previous version which creates more propulsion. I don’t think the Ultraboost 21 needs the extra propulsion because it’s not designed for fast running. The LEP system in the 21 makes the shoe feel too stiff and clunky. I really like the new outsole design of the Ultraboost 21. Our Verdict. If you're looking for a comfortable, sock-like upper, then the Adidas Ultraboost 22 is a great option. It features a fully knit upper that securely holds your foot in place. Cushioning is substantial, while still maintaining a firmness which allows this model to still feel snappy when you are picking up the pace. Ultraboost 21 Sizing: Innovation After Innovation. In hot pursuit of the ultimate running experience, Ultraboost 21 is designed to harmonize three key factors in running footwear: weight, cushioning, and responsiveness. With 6% more Boost capsules in the midsole than Ultraboost 20, these shoes are built to maximize energy return each time your Adidas Ultra Boost not comfortable. So I recently purchased the adidas ultra boosts in my search for most comfy sneakers. However after wearing them for a few days, I must say that my cheaper Nike dual tone racers are much more comfy. The ultra boost make my heels hurt and it feels like my left leg is shorter than my right one in them Based on my experience, the Ultraboosts are good running shoes for people starting out. Here are a few reasons why: Accommodating upper/wider toebox. As a person wide EE feet, I have never had problems in either of my pairs with respect to width. 7svtOLz.