Illegal speed The Tempo NEXT% isn't World Athletics approved as the midsole stack height exceeds the legal limit of 40mm. The heel is 45mm and the forefoot is 35mm. This confirms the notion that Nike have designed this as a training shoe and not a racing shoe.

I found that traction was great on dry surfaces but on wet pavement and wet grass it proved to be slightly slippery. The Tempo feels like a really well-built shoe and I expect it to last over 800 kilometres. ZoomX is Pebax while React is also a durable foam that doesn't lose much cushioning over time.

Nike Air Zoom is a cushioning system designed for speed and agility. This technology uses pressurized air and tightly stretched fibers to help absorb impact. While there are Nike Air Zoom running shoes, the technology is also featured in a range of Nike footwear.

Designed to be the training partner to some of Nike's speedier running shoes, such as the Nike ZoomX Vaporfly Next% 2, the Air Zoom Tempo Next% is built for long training miles, not race day.