adidas Ultraboost 21
The adidas Ultraboost 21 generates a linear energy push system with every step. What this means is that forefoot and midfoot stiffness increases through the stride to provide an extra energy boost at the end of your step. The temperature independent ultraboost midsole provides huge levels of energy return even as your feet heat up through the run, where some shoes would get softer and less responsive. A stretchweb outsole made from super grippy continental rubber moves with your footstrike to give a smoother and more flexible ride. The Primeknit+ upper is highly breathable and moulds to your unique foot shape for a comfortable feel and personalised fit.
The latest generations of the shoe offer the plush, bouncy, and cushioned underfoot feel that it’s become famous for but with a bit more support compared to earlier versions. All that cushioning comes with the trade-off of a little extra weight, which makes it better suited to longer, slower runs.
Adidas Boost technology is one of the most innovative cushioning systems used in athletic shoes today. Boost technology was first introduced by Adidas in 2013 and has since become a staple in many of the brand's popular shoe models.
So, what makes Boost technology so special? The secret is in the material used to create the cushioning. The midsole of the shoe is made of tiny TPU (thermoplastic polyurethane) pellets that are fused together under high pressure. This process creates a material that is incredibly durable, flexible, and lightweight.
When compressed, Boost material provides excellent energy return, which means that the shoe absorbs and then releases energy with every stride. This energy return not only provides a comfortable and responsive ride but also helps to reduce the impact on the feet and legs.
Another benefit of Boost technology is its ability to retain its cushioning properties even in cold temperatures. This is because the TPU material is not affected by temperature changes in the same way that traditional EVA foam is. This means that Boost shoes can be worn in a variety of conditions, making them a versatile choice for athletes and fitness enthusiasts.
Overall, Adidas Boost technology is a game-changer in the world of athletic footwear. Its combination of durability, energy return, and temperature resistance make it a top choice for anyone looking for a high-performance shoe.
Known primarily for their lightweight race shoes and the legendary Ultraboost, they’re also gaining fans for their popular Terrex outdoor range.
If you’re trying on a pair of adidas running shoes, expect innovative design, excellent styling, and a sustainable approach to construction.
• Weight: 340 g
• Midsole drop: 10 mm (heel 30.5 mm / forefoot 20.5 mm)
• Stretchweb outsole with Continental™ Rubber
• Lace closure
• adidas Primeknit+ upper
• Textile lining
• Supportive heel counter
• Boost midsole
- Quick Ref: 233137
- Man. Ref: FY0379
It might say road, but we don’t just mean pounding closed-off streets on race day. Road shoes are predominantly for the pavement.
They feature flat rubber traction for confident footing in the city and enhanced cushioning to soak up the strain of every stride.
Best for Everyday Mileage
To cope with all the miles you run, shoes for everyday mileage are built to last.
Thicker rubber on the outsole withstands huge amounts of pavement pounding, and a thicker, more durable upper also helps to improve longevity.
The other priority is comfort, with soft materials around the entrance and midsole foams designed to cushion, feel great, and last.
Because of the extra protection, daily mileage shoes tend to be heavier than their race day and tempo counterparts.
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