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

In this review of the Under Armour Men's Multi-Pack Performance Tech Long-Leg Boxer Brief the bottom line is simple: these are for active men who want a lightweight, breathable underlayer that stays in place during movement. The single biggest reason to buy is the combination of an insanely soft, moisture-wicking Performance Tech fabric and a 4-way stretch construction that moves with the body, so you get comfort for long runs, gym sessions, or a busy workday. The fit is described as fitted and streamlined, offering support without feeling overly tight.

Key Features

• Lightweight Performance Tech: The fabric is designed to be extremely soft and breathable so it feels comfortable against the skin during extended wear.
• 4-way stretch construction: The material moves with you in every direction so the boxer brief stays in place through running and dynamic activity.
• No-roll hem & Chafe-free seams: The hem and seams reduce ride-up and irritation, improving comfort for workouts and long days.
• Moisture-wicking material: Fabric wicks sweat and dries quickly, helping garments feel drier even during intense exercise.
• Performance waistband: The branded waistband is secure and low-profile so it holds the brief in position without digging in.

Who It's For

These boxer briefs are best for men who lead an active lifestyle: runners, gym-goers, and commuters who need underwear that manages sweat, stays in place, and offers coverage with a 9' inseam. The fitted, streamlined cut makes them suitable for wearing under athletic shorts or slim pants without excess bulk.

Those who should look elsewhere include buyers seeking heavy-duty, long-lasting work underwear for abrasive jobs or customers prioritizing classic loose-fit boxers. A small number of reports of seam failure mean people who need extreme durability for rugged daily tasks might prefer a different construction.

Pros & Cons

Pros

• Very soft, breathable fabric that feels comfortable against the skin for long periods.
• Stays in place during activity thanks to 4-way stretch and no-roll hem.
• Moisture-wicking performance keeps the fabric feeling drier during workouts.

Cons

• A minority of customers reported seam issues, so durability may vary between pairs.

Specifications

Brand	Under Armour
Product type	Men's long-leg boxer brief
Inseam	9 in
Fit	Fitted, streamlined
Key materials	Performance Tech fabric with 4-way stretch
Features	Tagless, no-roll hem, chafe-free seams, performance waistband

Our Verdict

If you want a lightweight, comfortable pair of active underwear that handles sweat and movement well, these long-leg boxer briefs are a solid pick; they deliver excellent comfort and stay-in-place performance for most athletes and daily users, though a few buyers reported seam durability concerns so they may not be ideal for heavy-duty wearers.

Frequently Asked Questions

Are these good for running?
Yes, the 4-way stretch and no-roll hem help the briefs stay put during runs while the moisture-wicking fabric keeps you drier.

How long is the inseam?
The inseam is 9 in, giving extra thigh coverage compared with shorter boxer briefs.

Do they show seams or cause chafing?
No side or back seams and chafe-free construction reduce irritation, though a few customers have reported seam failures after extended use.