New Balance Men's Fresh Foam X Hierro V9 Trail Runners (Style MLSZ)

Our review of the Fresh Foam X Hierro V9 finds it best for runners and hikers who want plush, modern cushioning paired with aggressive traction for technical trails; the single biggest reason to buy is the dual-density Fresh Foam X midsole, which provides a noticeably soft ride while retaining a stable feel underfoot. On packed dirt, rocky singletrack and mixed surfaces the shoe balances comfort and protection, and the toe and lug design make it a practical pick for day-long outings where grip and foot protection matter more than minimal weight.

Key Features

• Dual-density Fresh Foam X: Delivers a cushioned yet stable underfoot feel that soaks up trail chatter and reduces fatigue on long runs.
• Bio-based midsole content: Incorporates renewable materials for a slightly greener footprint while preserving the soft, responsive character of the foam.
• Vibram outsole with 6mm lugs: Provides superior grip on wet and dry terrain thanks to a deeper tread pattern and durable rubber compound.
• Toe Protect technology: Shields the forefoot from rocks, roots and debris so you can move confidently over rough ground.
• Gusseted knit tongue: Helps keep dirt out and improves fit security without sacrificing breathability on warm days.

Who It's For

The Fresh Foam X Hierro V9 is aimed at trail runners and outdoor enthusiasts who prioritize comfort and traction over low weight; it works well for long training runs, mixed-surface adventures and hikers who want running-shoe agility. Runners who favor a plush, cushioned ride with a slightly stable base will appreciate the dual-density midsole and the durable Vibram lugged outsole.

Those who should look elsewhere include ultralight racers and anyone needing a narrow, race-oriented fit or minimal road speed work, as the Hierro leans toward cushioning and protection rather than a minimal, race-flat feel.

Pros & Cons

Pros

• Comfortable, well-cushioned ride from the Fresh Foam X that reduces impact on longer outings.
• Excellent traction from the Vibram outsole and 6mm lugs for varied trail conditions.
• Durable protection with Toe Protect and a gusseted tongue to keep debris out.

Cons

• Some customers report inconsistent sizing and a fit that can feel small or snug for certain foot shapes.
• Not the lightest option for racers who want a minimal, fast shoe.

Specifications

Our Verdict

The Fresh Foam X Hierro V9 is a strong choice for runners and hikers who want a plush, protective trail shoe with confident grip; its dual-density cushioning and Vibram lugged outsole make it good value for those who prioritize comfort and traction over ultralight performance. It is recommended for day runs, technical trails and anyone needing extra underfoot comfort and durable protection.

Frequently Asked Questions

Do these run true to size?
Fit varies: some users find them true to size while others report a snug or slightly small fit, so try your usual trail running size or consider half size up if between sizes.

Are they good on wet rocks?
Yes, the Vibram outsole and 6mm lugs improve grip on wet and slippery surfaces compared with typical road shoes.

Is the midsole sustainable?
The midsole contains about 3% bio-based content from renewable resources, which reduces the carbon footprint modestly while keeping the Fresh Foam X feel.