Merrell Men's All Out Blaze Aero Sport Hiking Water

In this review of the Merrell Men's All Out Blaze Aero Sport Hiking Water Shoe the bottom line is clear: this is a lightweight, breathable trail and water shoe built for active hikers who want fast, comfortable footwear that handles wet and dry conditions. The single biggest reason to buy is the blend of breathable mesh with a protective Vibram outsole and UniFly midsole, which together deliver ventilation, underfoot cushioning and reliable traction on mixed terrain.

Key Features

• Breathable mesh uppers: A highly ventilated mesh construction promotes airflow to keep feet cooler and drier on long summer hikes or water crossings.
• Omni-Fit lacing system: The lacing design offers a glove-like, precise fit so the foot stays secure on technical or rocky trails.
• M Select FRESH lining: The mesh lining is treated to reduce odor buildup, making the shoes comfortable for multi-day use without constant washing.
• UniFly midsole cushioning: A cushioned midsole provides lightweight, protective underfoot support for all-day comfort on varied routes.
• TC5+ Vibram outsole: Durable rubber with 5 mm lug depth delivers dependable grip and lasting sole performance across wet rocks and dirt.
• Supportive overlays and heel counter: Synthetic overlays and a molded TPU heel counter add stability without heavy bulk.

Who It's For

The All Out Blaze Aero Sport is best for hikers and outdoor enthusiasts who prioritize weight savings, breathability and quick-drying performance. It suits day hikers, river runners, and anyone who prefers minimal, ventilated footwear that still offers protective cushioning and traction.

Those needing heavy insulation, aggressive mountaineering soles, or a narrow race fit should look elsewhere; this shoe favors a roomier, comfortable fit and excels in warm, wet, or mixed-terrain conditions rather than extreme cold or high-altitude technical climbs.

Pros & Cons

Pros

• Excellent breathability from the mesh upper keeps feet ventilated on long outings.
• Comfortable UniFly midsole and foam footbed provide lightweight cushioning for trails.
• Durable TC5+ Vibram outsole with 5 mm lugs gives reliable traction and longevity.
• M Select FRESH lining helps prevent odors for extended use between washes.

Cons

• The roomy fit may feel loose for very narrow-footed users, so some may prefer a different last or thicker socks.
• Not designed for insulated warmth in cold-weather conditions.

Specifications

Our Verdict

The Merrell All Out Blaze Aero Sport is a strong value for hikers who want a lightweight, breathable shoe that performs well on both wet and dry trails. Its combination of cushioning, durable Vibram grip and odor-resistant lining makes it a reliable everyday hiking and water shoe for summer use and travel.

Frequently Asked Questions

Are these good for water crossings?
Yes, the breathable mesh and quick-drying construction plus secure lacing make them well suited for streams and wet terrain.

Do they run true to size?
Most customers report a comfortable fit, though people with narrow feet may find them roomier and prefer a slightly tighter fit or thinner socks.

How durable is the outsole?
The TC5+ Vibram outsole with 5 mm lugs provides strong durability and traction on various surfaces, with many users noting long-lasting performance.