Under Armour Expanse Mid Waterproof Hiking Boots

Under Armour Expanse Mid Waterproof Hiking Boots

The Under Armour Expanse Mid Waterproof (Style 6000770) bridges the gap between a rugged backpacking boot and an agile trail runner. Designed for hikers who need extra stability on rough terrain, this 4.5-inch mid-cut boot provides essential ankle support without the heavy bulk of traditional hikers.

Weighing in at just 13.4 oz, this boot features a 100% waterproof, breathable membrane to keep feet dry through stream crossings and mud. The upper is armored with abrasion-resistant composite ripstop and a molded PU toe cap, while the underfoot is protected by an ESS Rock Plate to stop stone bruising. Powered by a Charged Cushioning® midsole, it absorbs impact mile after mile, reducing fatigue on long-haul treks.

FEATURES:

• Mid-Cut Stability: The 4.5" collar height offers increased ankle protection and stability on uneven ground compared to low-top trail shoes.
• Waterproof & Breathable: A watertight membrane locks out rain and puddles but allows sweat vapor to escape, preventing the clammy feeling of rubber boots.
• Armored Protection: Features a composite ripstop upper and a molded PU toe cap to deflect debris, plus an ESS Rock Plate in the sole for stability on jagged rocks.
• Energy-Returning Comfort: The Full-length Charged Cushioning® midsole provides a plush, responsive feel, absorbing the shock of heavy packs and hard descents.
• Anatomical Fit: Engineered with a wide toe box to allow natural toe splay and a molded INSITE® Contoura® footbed for consistent arch support.
• All-Terrain Grip: The High-traction rubber outsole features aggressive lugs specifically spaced to shed mud and grip slick surfaces.
• Height: 4.5" (Mid-Cut)
• Weight: 13.4 oz.
• Waterproofing: Yes (Internal Membrane)
• Insulation: Non-Insulated
• Offset: 4mm
• Lace Type: Standard Tie
• Safety: Non-Safety Toe (Soft Toe)
• Style Number: 6000770

Sizing & Fit Guide

• Fit: Regular / Anatomical.
• Runs Small: We recommend ordering ½ size up.
• Width: The anatomical shape is more accommodating for narrow to standard feet. 
• Sock Recommendation: If you plan on wearing heavyweight thermal wool socks for late-season hunts, consider going up a full size to maintain proper circulation.

Frequently Asked Questions (FAQ)

Are these good for snow/winter?
These boots are waterproof, so they will keep moisture out, but they are non-insulated. For use in snow, you would need heavy thermal socks to stay warm. They are primarily designed for 3-season hiking.

Are the UA Expanse Mid boots waterproof?
Yes. They feature a breathable membrane that is 100% waterproof. This barrier locks out rain and mud while allowing internal sweat vapor to escape, keeping your feet dry during active use.

Can I use these for trail running?
These are designed primarily as lightweight hiking boots with a 4.5" mid-cut for ankle stability. However, because they utilize the same Charged Cushioning® and high-traction outsole found in UA running shoes, they can be used for faster-paced movement if you prefer the extra ankle support over a traditional low-top runner.

Is the insole removable?
No. The INSITE® Contoura® footbed is molded into the boot to ensure the correct arch support and structural integrity.