Continuing the brand's commitment to sustainability is the shoe's Primeblue upper constructed with at least 50 percent of Parley Ocean Plastic, while a Primeknit+ design allows for a more precise knit providing additional support and enhanced movement. The updates continue onto the Boost midsole with 6 percent more Boost capsules from the prior model while the new LEP (Linear Energy Push) torsion system delivers less flex in the forefoot for a more responsive stride.