New Balance Fresh Foam X Hierro V8 First Run: Comfort-First Trail Shoe With a Sustainability Story

Introduction

The New Balance Fresh Foam X Hierro V8 is the latest version of a shoe that has long served as the brand’s popular road-to-trail option. It is not built with the deepest or most aggressive lug pattern in the trail category, but it pairs a generous dose of New Balance’s softest midsole foam with Vibram rubber on the outsole, and it arrives with an unusually strong sustainability story. This first run took the V8 through seven-plus miles of mixed terrain: tarmac, compacted trails, gravel, wet wood, tree roots, and plenty of genuinely boggy mud.

Specs and Sustainability Credentials

The Hierro V8 carries over the full Fresh Foam X midsole introduced on the previous version, with a 6mm drop, a 26mm heel stack, and a 20mm forefoot stack. A UK size 10 pair weighs 310g. The outsole uses a 4mm lug design in Vibram Ecostep recycled rubber, split between smaller oval lugs down the centre of the shoe and chunkier lugs around the perimeter.

Sustainability is a real highlight here. The upper mesh is made from 100% recycled polyester sourced from textile waste, the midsole foam contains 40% bio-based material, and the outsole rubber is recycled. New Balance positions the Hierro V8 as the most sustainable running shoe it has ever produced, which is good to see from a major brand.

Upper, Fit and Comfort

The upper feels plush and comfortable straight out of the box. There is a good level of protection up front thanks to a substantial toe bumper, a standard padded tongue with small perforations for breathability, a handy heel loop, and a midfoot locking system built into the lacing that delivers genuinely good lockdown.

On fit, New Balance trail shoes tend to run a little small. Going up half a size to a UK 10 delivered a strong fit in length, with good width in the toe box and comfortable wiggle room. The overlays wrapping the heel, lace eyelets, and toe box appear to be made from recycled material too, and the heat-map style colour effect in the mesh is a nice design touch.

Ride and Cushioning

Fresh Foam X is the same foam used in New Balance’s maximally cushioned More Trail V3, though with considerably less of it underfoot here. That difference matters. The Hierro V8 feels plush and comfortable on hard surfaces, to the point where you could happily run on tarmac all day, but it is not over-cushioned. Ground connection and feel remain solid on uneven, technical terrain, which was a persistent weakness in the More Trail V3.

At 310g there was a concern the shoe might feel heavy or clunky, but the opposite proved true. It feels nicely balanced and surprisingly lively and responsive underfoot, more exciting to run in than expected.

First Run Impressions

The test run covered 7.2 miles across a demanding mix of surfaces in wet woodland. Long tarmac and hard-standing sections were soaked up comfortably, and the Fresh Foam X midsole felt super plush throughout, with a ride very close to a road shoe. On compacted trails, gravel paths, greasy wood, and slippery tree roots the shoe stayed confident and stable, and the legs felt loose and strong by the end.

Overall, the first run was a genuinely pleasant surprise for a first outing with this model. The combination of a comfortable upper, secure midfoot lockdown, and a well-judged midsole makes it an easy shoe to like across mixed terrain.

Grip and Outsole Performance

The outsole performed well on most of the trails encountered. Traction was good on loose gravel, very good on wet tarmac, wet wooded walkways, and slippery tree roots, and it coped acceptably with lightly muddy trails. The exception was deep, boggy, waterlogged mud, where the Hierro V8 genuinely struggled, slipping and sliding enough to force a much slower, more careful pace.

That weakness is largely a matter of design intent rather than a flaw. With 4mm lugs and a road-to-trail brief, the V8 is clearly built for drier conditions. In heavy mud a more aggressive shoe is the better tool. As a spring, summer, and autumn trail shoe with long tarmac sections mixed in, it should work very well.

Buying Advice

The Hierro V8 makes sense for runners who want one comfortable shoe that handles road-to-trail transitions without fuss. It suits longer training runs and races on mixed routes that include significant tarmac, hard-packed trails, and gravel, particularly in the drier months. Runners who regularly face deep mud or want maximum technical grip should look at more aggressively lugged alternatives, and anyone buying should consider going up half a size given the snug New Balance fit.

Conclusion

The New Balance Fresh Foam X Hierro V8 is a comfortable, lively, and well-balanced road-to-trail shoe with a genuinely impressive sustainability profile. Grip is dependable everywhere except deep mud, the Fresh Foam X ride is plush without losing ground feel, and the upper is comfortable straight from the box. For drier-month training and racing on mixed terrain with plenty of tarmac, it is an easy shoe to recommend, with deeper mud clearly outside its intended brief.