Under Armour Men's Mk-1 Active Shorts - Lightweight and Breathable Fit

Our review of the Under Armour Men's Mk-1 Shorts finds they are a simple, effective option for athletes and anyone who wants lightweight, breathable warm ups. The biggest reason to buy is the combination of a stretchy, quick-drying knit and mesh side panels that keep moving workouts comfortable without extra bulk; the shorts feel light on and wick sweat reliably during runs, gym sessions, or post-game cool down. For those who value mobility and fast-drying fabric, these shorts deliver solid everyday performance.

Key Features

• Stretchy knit fabric: provides a soft, lightweight feel that reduces restriction during dynamic movement and stays comfortable for long wear.
• Quick-drying material: wicks sweat away from the skin so the shorts dry fast after intense training or humid conditions.
• 4-way stretch construction: allows the fabric to move with the body so lunges, sprints, and multi-directional drills feel less limited.
• Mesh side panels: add targeted airflow where heat and sweat build up, improving ventilation during high-output sessions.
• Encased elastic waistband with drawcord: gives an adjustable, secure fit that stays in place without digging in.
• Open hand pockets: offer convenient storage for small items without adding bulk or a liner.

Who It's For

The Mk-1 Shorts are best for active men who want a lightweight, versatile short for training, warm ups, and casual wear; the 7 in inseam sits in a modern mid-length that works for runners, gym-goers, and field players alike. They suit anyone who prioritizes breathability and motion-the 4-way stretch and mesh panels make them a natural choice for workouts that require range of movement.

Those looking for compression or a built-in liner should look elsewhere, since these shorts have no liner and are designed for a freer, breezier feel rather than internal support. If you need heavy weather protection or thicker fabric for cold outdoor use, a different, insulated short or layered option would be a better fit.

Pros & Cons

Pros

• Lightweight knit fabric that stays comfortable during long sessions.
• Effective moisture wicking and fast drying for sweaty workouts.
• 4-way stretch and mesh panels improve mobility and airflow.
• Adjustable encased waistband keeps fit secure without discomfort.

Cons

• No internal liner may be a drawback for those who prefer built-in support or compression.
• Open hand pockets provide limited secure storage compared with zippered pockets.

Specifications

Brand	Under Armour
Material	90% Polyester / 10% Elastane
Inseam	7 in
Pockets	Open hand pockets
Liner	No liner
Waist	Encased elastic with internal drawcord
Ventilation	Mesh side panels

Our Verdict

The Under Armour Mk-1 Shorts are a good-value, no-frills active short that excels at breathability, mobility, and quick drying; they are ideal for workouts, warm ups, and casual athletic use. Buy them if you want a lightweight, stretchy short that performs across activities, but choose a different model if you need a liner or secure zippered pockets.

Frequently Asked Questions

Do these shorts have a liner?
No, the Mk-1 Shorts do not include a liner; they are designed as a liner-free, breathable short.

What is the inseam length?
The inseam measures 7 in, which gives a mid-length fit suitable for running and training.

Are the pockets secure for keys?
The shorts have open hand pockets that are convenient for small items but are not zippered, so they offer limited security for valuables during intense activity.