Under Armour Men's Performance Tech Long-Leg Boxer Brief - All-Day 90%

In this review of the Under Armour Men's Multi-Pack Performance Tech Long-Leg Boxer Brief, the bottom line is simple: these are aimed at active guys who want soft, breathable underwear that stays in place during long runs and workouts. The single biggest reason to buy is the fabric and fit combination - a 90% polyester, 10% elastane blend with 4-way stretch that wicks sweat and dries fast, delivering consistent comfort through heavy activity. For anyone who values length, a seam-free back and quick-drying performance, this boxer brief is worth trying.

Key Features

• Soft performance fabric: The 90% polyester and 10% elastane blend provides an instantly soft feel that reduces chafing during extended wear.
• Moisture-wicking: Material moves sweat away from the skin and dries quickly to help keep the wearer comfortable during intense exercise.
• 4-way stretch construction: The stretch fabric allows freedom of movement in every direction, useful for running, lifting or everyday activity.
• Articulated mesh fly panel and gusset: Targeted mesh improves airflow and adds comfort where ventilation matters most.
• No side or back seams: The smooth construction reduces irritation and pressure points under tight clothing.

Who It's For

These boxer briefs suit men who regularly exercise, run or work long shifts and need underwear that stays in place and handles sweat. The 9' inseam provides extra coverage and prevents riding up for those who prefer longer leg length during activity.

Men who prioritize durability above all else or who need natural fibers exclusively may want to look elsewhere, since this style is synthetic-dominant and some customers have reported inconsistent longevity at the seams.

Pros & Cons

Pros

• Very comfortable, with customers praising the soft hand and secure fit that helps them stay in place during runs.
• Excellent moisture management; fabric wicks sweat and dries fast even during heavy workouts.
• Seamless side and back design reduces friction when worn under tight clothing.

Cons

• Some users reported seam failure on certain pairs, indicating variable durability between production runs.
• Those who prefer natural fibers may dislike the mostly polyester construction.

Specifications

Our Verdict

These long-leg boxer briefs are a smart pick for active men who want a soft, moisture-managing underwear that stays in place during exercise. While a few reports note seam problems, the fit, fabric performance and seam-free design make them good value for most athletes and commuters who need reliable, comfortable daily performance underwear.

Frequently Asked Questions

Are these good for running?
Yes. The 4-way stretch, longer 9 in inseam and moisture-wicking fabric make them suitable for running and dynamic training.

Do they dry quickly after sweating?
Yes. The polyester-rich blend is designed to wick sweat and dry faster than cotton alternatives.

Will they stay in place or ride up?
Most customers report they stay in place thanks to the fit and stretch construction, though fit can vary by body shape.