The collar bulk has been removed too, meaning the fit feels more precise and less clumsy, all of which contribute to a more streamlined and compliant rear to the shoe. The Adidas Ultraboost has an enhanced design and new materials which have utilized the latest technology making the shoe to rank among the top footwear in the world. The breathable primeknit upper and cushioning make it comfortable. The boost midsole technology delivers the best fitting result combined with the Torsion Spring and stretchy outsole. Adidas Running Shoes According to adidas, there's no weight gain or loss with the 19 (310g for UK 8.5) so for 20% more boost, that seems like a good deal. They are however still on the heavy side (and won't be breaking any marathon records any time soon), but these shoes will munch up miles. Whether you're a lighter runner looking for a big milage shoe or a larger runner looking for that comfortable race shoe, the ultraboost 19 would be a worthy consideration. Adidas Ultraboost 19 is the latest version of the Adidas Ultraboost running shoes with updated features that make it one of the best running shoes ever to be made by Adidas. Adidas upgraded the features of the Ultraboost to enhance its performance and make the shoe deliver to the expectations of customers. Adidas Ultraboost 19