Under Armour Men's Mk-1 Shorts - Lightweight Stretch Performance

Our review of the Under Armour Men's Mk-1 Shorts finds they are an ideal pick for men who need a lightweight, breathable short for training, warm ups, or casual wear; the single biggest reason to buy is the combination of super-light stretchy knit fabric and fast-wicking material that keeps you comfortable during sweat-heavy sessions. These shorts strike a balance between athletic performance and everyday comfort, offering a dependable 4-way stretch and mesh ventilation that make them useful across sports and daily routines without feeling restrictive.

Key Features

• Lightweight knit fabric: Feels barely there during movement so workouts and warm ups stay comfortable without added bulk.
• Fast-wicking material: Dries quickly after intense sessions to help you stay dry and avoid chafing during longer workouts.
• 4-way stretch construction: Moves with the body for unrestricted mobility in every direction during sprints, lunges, or multidirectional drills.
• Mesh side panels: Increase airflow where you need it most, helping regulate temperature on hotter days or during high-intensity training.
• Encased elastic waistband with drawcord: Provides a secure, adjustable fit so the shorts stay in place through activity without digging in.
• Open hand pockets: Add quick storage for small items like keys or a phone when you are on the go.

Who It's For

The Mk-1 shorts are best for active men who want a versatile short that performs for gym sessions, practice, or casual post-game wear; the lightweight knit and 7' inseam make them well suited to runners, gym-goers, and team-sport players who value breathability and stretch. The shorts are also practical for travel or warm-weather days when low weight and fast drying are priorities.

Men looking for compression liners, heavy-duty pockets, or a very long inseam should look elsewhere, since these Mk-1 shorts have no liner and a 7' inseam designed for mobility rather than full coverage or gear-heavy use.

Pros & Cons

Pros

• Very lightweight and stretchy fabric for unrestricted movement during training.
• Material wicks sweat and dries fast, keeping you comfortable in intense sessions.
• Mesh side panels enhance breathability in high-heat or high-effort situations.
• Adjustable encased waistband ensures a secure fit without irritation.

Cons

• No built-in liner, so users who prefer compression support will need separate undergarments.
• Pockets are open hand pockets only, so they offer limited security for valuables during vigorous activity.

Specifications

Our Verdict

The Under Armour Mk-1 Shorts are a solid value for men who want a lightweight, breathable training short that moves with them and dries quickly. They are particularly well suited to gym workouts, team practice, and warm-weather wear; choose them when you need mobility and ventilation, but not if you require an internal liner or secure zip pockets.

Frequently Asked Questions

Do these shorts have a built-in liner?
No, the Mk-1 shorts do not include a liner; wear compression shorts underneath if you want added support.

What is the inseam length?
The inseam measures 7 in, offering a mid-length cut that balances coverage and mobility.

Are the shorts breathable for hot weather?
Yes, the mesh side panels and fast-wicking fabric improve airflow and help the shorts dry quickly in warm conditions.