Merrell Men's All Out Blaze Aero Sport Hiking Water Shoe - Lightweight

Our review of the Merrell Men's All Out Blaze Aero Sport Hiking Water Shoe finds it best suited to hikers and outdoor enthusiasts who want a lightweight, breathable trail shoe that doubles as a water shoe. The single biggest reason to buy is the combination of airy mesh construction with a protective UniFly midsole and Vibram TC5+ outsole, which together deliver ventilated comfort and confident traction on wet or dry trails. This shoe is a practical choice for day hikes, river crossings, and warm-weather trekking where quick drainage and low weight matter.

Key Features

• Breathable mesh upper: The lightweight mesh keeps feet ventilated on warm hikes while synthetic overlays provide targeted support where it is needed.
• Omni-Fit lacing system: The lace-up design creates a glove-like fit for secure foot hold on uneven terrain and during water crossings.
• M Select FRESH lining: The mesh lining is treated to help prevent odors, so the shoe stays fresher after repeated wear in wet conditions.
• UniFly midsole: The cushioned midsole gives low-profile protection and a responsive feel without adding unnecessary weight.
• TC5+ Vibram outsole: The durable outsole with 5 mm lug depth provides reliable grip on trails and rocks while remaining flexible for trail scrambling.
• Practical details: Molded TPU heel counter, bellows tongue and heel pull loop improve stability, debris control and ease of on/off.

Who It's For

The Merrell All Out Blaze Aero is ideal for hikers who prioritize light weight, breathability and quick-drying performance, such as day hikers, canoeists, or anyone tackling mixed trails with wet sections. Its mesh construction and odor-control lining make it particularly good for warm-weather use and activities where water exposure is expected.

Those who want heavy-duty ankle support or a thickly cushioned long-distance backpacking shoe should look elsewhere; this model emphasizes low weight and agility over maximal padding or high-cut stability. Buyers with very narrow feet may find the fit roomier, so trying on for fit is recommended.

Pros & Cons

Pros

• Excellent breathability and ventilation from the mesh upper for warm-weather comfort.
• Comfortable, lightly cushioned UniFly midsole provides responsive protection without bulk.
• Durable TC5+ Vibram outsole delivers dependable traction and long-lasting wear on trails.
• Odor-fighting M Select FRESH lining helps keep the interior feeling fresher after wet use.

Cons

• Low-cut, lightweight design sacrifices ankle support needed for heavy backpacking.
• Some wearers with narrow feet may find the fit a bit roomy without thicker socks.

Specifications

Upper	Breathable mesh with synthetic overlays
Lining	Mesh treated with M Select FRESH odor control
Midsole	UniFly cushioned protective midsole
Outsole	Vibram TC5+ with 5 mm lug depth
Lacing	Omni-Fit lace-up system
Additional details	Molded TPU heel counter, bellows tongue, heel pull loop

Our Verdict

The All Out Blaze Aero is a strong choice for hikers who want a lightweight, ventilated shoe that handles both trail and water with confidence. It offers good value for day hikes and warm-weather adventures thanks to the UniFly midsole, Vibram outsole and odor-resistant lining; choose a different model if you need heavy ankle support or a very narrow fit.

Frequently Asked Questions

Are these shoes good for river crossings?
Yes, the breathable mesh construction and quick-draining design make them well suited to wet crossings while the Vibram outsole helps maintain traction on slippery surfaces.

Do they control odor after repeated wet use?
The mesh lining is treated with M Select FRESH technology to help prevent odors, which customers report keeps the interior fresher over time.

Are they suitable for long backpacking trips?
They are best for day hikes and light trail use; hikers needing high ankle support or heavier cushioning should consider a different, more robust boot.