Nike ACG ZoomX Ultrafly 2 Men's Trail Running Shoes

The Ultrafly 2 takes what you love about the original and refines it, so you can go the distance. The springy ZoomX foam is more responsive, and the full-length carbon plate is softer for a smooth ride. The outsole helps reduce weight while maintaining enhanced grip as the miles pile up.

Breathable Mesh Upper

Designed using a breathable mesh, the upper of the ACG Ultrafly 2 encourages cool air to circulate, while at the same time removing unwanted warm air, helping to control temperature and create a microclimate where feet can thrive. Made from abrasion-resistant materials, the shoes are highly durable, providing excellent protection for your feet and shoes and stand up to the rigours of trail running. The padded heel collar sits close to the foot to increase comfort, while the flat-laying tongue helps to reduce irritation caused by rubbing. Completing the upper is a traditional lacing system which locks the midfoot to prevent excessive movement for a secure fit.

ZoomX Midsole

Implementing a ZoomX midsole, the ACG Ultrafly 2 delivers Nike Running's greatest energy return yet. The Ultrafly 2 adds more ZoomX for responsive comfort on race day. Ultra-light and super-responsive, the midsole material delivers Nike's greatest energy return yet; it absorbs impact and then expels it back out for a bounce-like effect. This energy-return technology reduces the use of superfluous muscle power, diminishing fatigue and enhancing performance, keeping you going for longer. The revolutionary ZoomX foam is manufactured from Pebax, a product conventionally used in plastic bridges and other moulded parts, and yields cushioning that is not only lightweight but soft and springy. Until now, these three characteristics (collectively) have proven nearly impossible to achieve. Pebax has a lower density than some thermoplastic alternatives, and this makes it lighter, flexible and more impact-resistant, whilst giving it a higher capacity for energy return. When blown into a foam, these properties remain, gifting you with a lively underfoot feeling that encourages you to run fast. Signalling the incredible resilience of ZoomX, the tiny creases that occur on every midsole do not have an impact on the foam's performance; these beauty marks are a result of the autoclave process, which places the foam under extreme heat and pressure. The ZoomX sheets are then compressed in a Phylon preform, which shapes the midsole parts. Because the special foam is so lightweight (one-third the weight of Cushlon), Nike is able to use more of it to separate your foot from the trail; this means you get a thick and supportive midsole that will spare your joints as you strike down onto hard, unforgiving surfaces. Embedded within the midsole is a full-length carbon Flyplate. Intended to minimise energy, the carbon plate springs up under your heel as you stride forward, yielding the snappy, propulsive sensation that converts into extra-energised strides. The plate is curved at the front, enhancing energy return so you're able to push further for longer.

Vibram Megagrip Outsole

Developed with a Vibram Megagrip outsole, the Ultrafly 2 provides extreme grip and multi-directional traction across varied and technical terrain, in both dry and wet conditions. The extremely durable rubber forms a solid bond with the ground, ensuring non-slip performance and anchoring the wearer in place. The deep, multi-directional lug pattern includes greater spacing, which allows the rubber to cut into the ground. The durable rubber is designed to withstand abuse from rough ground, deflecting blows and retaining its strong shape and structure for long-lasting performance.