New Balance Hierro

Ten Years of Development for One of the Most Versatile Trail Series - New Balance Hierro

New Balance Fresh Foam X Hierro is a trail running series designed for versatile use on trails – from everyday training to long-distance races.

History: From Flexible Trail Shoe to Max-Cushion Platform

The Hierro series was launched in 2015 and has since become a staple in New Balance's trail offerings. Over the decade, it has undergone significant transformation: the first generation focused on a more flexible, "grounded" feel, closer to a classic trail shoe. Over time, the philosophy shifted towards enhanced cushioning, lower drop, and rocker-assisted ride capable of handling ultra distances. This evolution is best seen in the comparison of the two latest generations – v8 and v9.

Hierro v8: The Crossover of Old and New Philosophy

The v8 version stands right at the boundary between the older and newer approaches – it combines the comfort of the road series 1080 with a highly grippy trail outsole. The Fresh Foam X midsole is one of the softest foams in New Balance's lineup and now contains approximately 40% biodegradable materials. The Vibram Eco-Step Natural outsole is made from over 90% petroleum-free components and, thanks to Micro-Traction Lug technology, offers exceptional grip on lighter to moderately challenging terrain – reviewers report virtually no wear on the tread even after more than 160 km of use.

Hierro v9: A Bold Restart with Enhanced Cushioning

The v9 version represents a more pronounced reboot of the entire series – it abandons the flexible, "grounded" character of earlier versions in favor of a stiffer, maximally cushioned platform with a low 4 mm drop and a stack height of 42 mm in the heel / 38 mm in the forefoot. The dual-layer midsole combines a softer top layer for comfortable landings with a firmer base that protects the foot from rocks and roots. The newly emphasized rocker in both the heel and forefoot provides a smoother, momentum-supporting ride. The outsole transitions to Vibram MegaGrip – a sticky rubber compound balanced between grip and durability in wet and dry conditions, with minimal wear even after extended use.

Durability

Both generations are among the more durable trail models on the market – you can realistically expect a lifespan of 500–700 km depending on terrain and running style, with the outsole typically lasting longer than that of competing lighter trail shoes.

Who Is This Model For

The Hierro is for you if you're looking for a comfortable trail shoe for daily training and longer runs – the v8 is better suited for simpler, less demanding terrain, while the v9 can handle ultra distances thanks to its enhanced cushioning. Both versions are less suitable for muddy conditions or extremely technical, slippery descents.