Manufacturing focused: the Boost midsole material is licensed by adidas from the BASF company. That means a licensing fee that makes the material more costly to use than if it had been developed in house (like Nike's React foam was).

To create Boost, Thermoplastic Polyurethane particles are expanded to form closed cells around tiny pockets of air. The resulting product is known as expanded Thermoplastic Polyurethane—or eTPU, for short.

The lifespan of Adidas Ultra Boost shoes can vary depending on several factors such as usage frequency, maintenance, and terrain. Typically, with regular use, the shoes can last up to 6 to 8 months before needing a replacement.

The Ultra BOOST has three key features that I love: the Primeknit upper, the torsion system, and boost energy foam. The Ultra BOOST is a really great daily trainer that could double as a race day pick as well. My next race is the Baltimore 10-miler in June and this shoe is certainly a contender.