How to Choose Workout Clothes for Men | The Fit-First Method

Choosing workout clothes for men comes down to one idea: match the fabric and the fit to what you’re actually doing. For intense, sweaty sessions, that means moisture-wicking synthetics that pull sweat off your skin and evaporate it, paired with a cut that lets you move without chafing. Under Armour’s men’s workout-clothes guide makes the priority clear — start with fit, then build everything else around it.

Most guys overthink the brand and underthink the two things that matter: the material and how it sits on your body. Cotton holds sweat and turns heavy; polyester and nylon move it away. Get those two choices right and you’ve solved 80% of the problem.

What Fabric Works Best For Sweaty Workouts?

Polyester and nylon blends beat cotton for anything that makes you sweat, because they wick moisture instead of absorbing it. Nike’s moisture-wicking explainer calls polyester the most popular wicking material and the basis of its Dri-FIT line, citing its durable, lightweight, breathable nature. Nylon appears just as often in athletic gear and can offer better wicking in some constructions.

Here’s the simple breakdown of the three fabrics you’ll actually see on labels:

• Polyester — the workhorse. Dries fast, holds its shape, and resists odor better than cotton. Look for it in almost any performance tee or short.
• Nylon — smoother and often softer, with strong wicking ability. Common in compression gear and shorts that need stretch and durability.
• Cotton — fine for walking or light yoga, wrong for anything intense. It absorbs sweat, stays wet, and chafes.
• Elastane/spandex — rarely the main fabric, almost always blended in at 5–15% to add stretch and keep clothes close to the body.

Check the label for “moisture-wicking” or “quick-dry” terms and synthetics in the blend. A mesh or perforated panel across the back or under the arms is a bonus — it vents heat where your body produces the most of it.

How Should Workout Clothes Fit?

Athletic or fitted cuts that skim the body without squeezing are the safest default; relaxed cuts work for low-key training where you don’t want fabric touching you. Under Armour’s guide breaks fits into three groups: Fitted for close-to-skin compression, Athletic for a cut that skims the chest, waist, and hips while allowing active movement, and Relaxed for a loose drape. Name labels vary, but most brands offer something in each camp.

The golden rule: measure, don’t guess. Sizing guides, including Under Armour’s, recommend measuring yourself in your undergarments for accuracy. Use a soft tape to get your chest, waist, and hips, and for bottoms add your inseam — the inside-leg length that determines whether shorts or joggers ride up or bunch. Skip the “usual size” guess; gym brands cut tighter than casual wear.

If you land between sizes, go up. A slightly roomier garment restricts less and chafes less than one that’s tight. “Fitted” should never mean “restrictive” — your gear should support full range of motion without limiting circulation or joint movement.

What Should I Wear For Different Types Of Training?

Match the cut and fabric to the workout: light and ventilated for cardio, close-fitting for high-movement training, layered for outdoor cold. Under Armour’s own guide tells you to choose for the activity first, then check the fit. The quick rules:

• Running or hot cardio — lightweight, loose-ish synthetic top and shorts with vents. You want airflow and zero extra weight.
• Lifting or HIIT — athletic or fitted cuts stay close so they don’t catch on bars or snag on benches. Shorts should sit above the knee with a secure waistband.
• Yoga or mobility — maximum stretch. Look for a high elastane percentage and a cut that doesn’t ride up when you fold or reach.
• Cold-weather outdoor training — a thermal base layer that still wicks, then a windbreaker shell. Skip cotton entirely; it traps sweat against the skin and chills you fast.

For bottoms specifically, use the inseam measurement — it’s the difference between shorts that stay put and ones that bunch on every rep.

A Quick Fabric Reference

When you’ve narrowed down your fabric and fit, the final step is trying a few brands side by side — sizing guides are product-specific and don’t transfer perfectly across labels. If you’re ready to compare tested options, our roundup of the best workout clothes for men breaks down the top picks by activity and budget.

Both Nike’s material science and Under Armour’s men’s workout clothes guide agree on the fundamentals: check the fabric, measure the fit, and let the workout dictate the rest. The guy who buys one quality synthetic athletic-fit shirt and one pair of properly sized shorts is better equipped than the one with a drawer full of cotton.