Under Armour Mens Mk-1 Shorts - Lightweight, Breathable Active Shorts

Our review of the Under Armour Mens Mk-1 Shorts finds them best for athletes and regular gym-goers who want a lightweight, breathable short for training and warm ups; the single biggest reason to buy is the combination of a stretchy, moisture-wicking knit and mesh side panels that keep you cool while moving. These shorts feel unusually light on, dry quickly after sweat, and offer unrestricted motion thanks to the 4-way stretch fabric, so they work well for short runs, court sessions, and post-practice wear.

Key Features

• Lightweight knit fabric: makes the shorts comfortable for extended wear and prevents a heavy, clingy feel during high-intensity training.
• Moisture-wicking material: pulls sweat away from skin and dries quickly so the wearer stays drier between sets or drills.
• 4-way stretch construction: allows full range of motion so lunges, sprints, and lateral movements are not restricted.
• Mesh side panels: increase airflow along the legs to improve breathability in warm conditions or during long sessions.
• Encased waistband with drawcord: secures fit without pinching and lets you fine-tune waist tension for comfort during activity.
• Open hand pockets: provide convenient storage for small items like keys or a phone during warm ups and cooldowns.

Who It's For

The Under Armour Mens Mk-1 Shorts are aimed at men who train regularly and want a versatile short for gym workouts, practice, and casual wear; the stretchy knit and quick-dry fabric suit those who sweat and need mobility. Runners doing short tempo runs, court athletes who change direction often, and anyone who values light, breathable gear will appreciate these shorts.

Those who want built-in compression or an internal liner should look elsewhere, since these shorts have no liner. If you need long-distance running specifics like reflective elements or a longer inseam, these 7' in inseam shorts may not be ideal.

Pros & Cons

Pros

• Very lightweight and comfortable for long training sessions.
• Fabric wicks sweat effectively and dries fast after workouts.
• 4-way stretch and mesh panels provide excellent mobility and breathability.
• Practical encased waistband with internal drawcord keeps fit secure.

Cons

• No liner, so some users may prefer added support or coverage for running.
• Inseam at 7' in may be too short for those who prefer longer coverage.

Specifications

Brand	Under Armour
Material	90% Polyester / 10% Elastane
Inseam	7' in
Pockets	Open hand pockets (Yes)
Liner	No liner
Waist	Encased elastic with internal drawcord

Our Verdict

The Mk-1 Shorts are a strong choice for athletes who prioritize breathable, quick-drying shorts with excellent stretch and a secure waist. They are good value for anyone who trains hard and wants a light, mobile short for gym, practice, or casual wear, but those needing a liner or longer inseam should consider alternatives.

Frequently Asked Questions

Do these shorts have built-in underwear or a liner?
They do not include a liner; these are single-layer knit shorts.

Are they suitable for running in warm weather?
Yes, the lightweight fabric and mesh side panels make them well suited to warm-weather runs and high-intensity training.

How does the waistband adjust?
The shorts use an encased elastic waistband with an internal drawcord to fine-tune the fit.