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To achieve this, Nike pumped the Zoom Air units to different pressures. Having carried out some research, they found that women preferred a softer landing in comparison to men. The designers at Nike have also decided to tune the Zoom Air unit so it is gender-specific. The unit works by giving the shoe an instant bounce, making it extremely responsive. The shoe has a Zoom Air unit, located in the forefoot. I also felt a noticeable spring in my step, when comparing to Pegasus 36 and earlier editions. The React foam cushioning works by offering more energy return which I found more apparent when running downhill. This responsive foam is super soft, lightweight, and extremely durable. So, what are the big changes? Well, one of the first and most important changes is the inclusion of React Foam cushioning in the midsole.
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