Quick answer

For working out, choose underwear made from breathable, moisture-wicking fabrics like nylon or microfiber blends that offer a secure fit without digging in. Avoid cotton-only options that trap sweat. Look for styles with stretch and flat seams to prevent chafing, and consider the intensity of your activity.

When you're exercising, the last thing you want to worry about is your underwear. But the wrong pair can cause chafing, discomfort, and even skin irritation. Choosing the right underwear for your workout is about more than just style—it's about performance and comfort.

In this guide, we'll break down what to look for in active underwear, from fabric to fit, and offer practical tips to help you stay focused on your workout.

Fabric Matters: Breathable and Moisture-Wicking

The fabric of your underwear plays a huge role in how comfortable you feel during exercise. Look for materials that wick moisture away from your skin, keeping you dry and reducing friction. Synthetic blends like nylon and spandex are popular choices because they are lightweight, stretchy, and dry quickly.

Cotton, while soft, tends to absorb sweat and stay damp, which can lead to chafing and discomfort. Save cotton underwear for lounging or low-intensity activities. For workouts, choose performance fabrics that move with you.

  • Check the label for nylon, spandex, or microfiber blends.
  • Avoid 100% cotton for high-sweat activities.
  • Look for fabrics with a soft, stretchy feel that won't irritate your skin.

Fit and Coverage: Finding Your Style

The right fit is crucial. Underwear that is too tight can cause digging and discomfort, while loose styles may bunch up and create friction. Look for a snug but not restrictive fit that stays in place during movement.

Consider the coverage level that makes you feel secure. Briefs and bikini styles offer more coverage and support, while thongs minimize lines and are great for workouts that involve bending or stretching. Choose what feels most comfortable for your body and activity.

  • Opt for adjustable straps or waistbands for a customizable fit.
  • Try different styles to see what stays put during your favorite exercises.
  • Remember that seamless or flat-seam designs can reduce chafing.

Support and Versatility for Different Workouts

Different activities demand different features. For running or high-impact sports, you might want extra support and a secure fit. For yoga or Pilates, a breathable, flexible style that moves with you is key.

Some pieces are designed to double as outerwear or layering pieces, offering versatility. For example, a cami with a built-in bra can be a great option for low-impact activities, reducing the number of layers you need.

  • For running: choose high-waist or compression styles for support.
  • For yoga: opt for soft, stretchy fabrics that allow full range of motion.
  • For gym workouts: consider moisture-wicking briefs or boy shorts.

Decision Rules for Choosing Workout Underwear

  • If you sweat a lot: Choose underwear made from moisture-wicking synthetics like nylon or microfiber. Avoid cotton, which traps sweat. Look for fabrics that dry quickly.
  • If you're doing high-impact activities: Opt for styles with more coverage and support, like briefs or high-waist options, to prevent shifting. Secure fit is key for running or jumping.
  • If you prefer minimal lines: Try thongs or seamless styles that reduce visible panty lines, especially for tight workout leggings. Choose a style that feels comfortable and stays in place.

Products to Consider

  • Whisper Stacked Cami 1 Ply: Crafted from Italian net fabric composed of 88% nylon and 12% spandex for a soft, stretchy feel. Features adjustable straps for a customizable fit. This cami offers breathable, stretchy fabric that works well as a layering piece over your sports bra or for low-impact workouts. The adjustable straps help you get a secure fit.
  • Delicious Scoop Shell: This scoop neckline shell is wonderful as a layering piece under your sweaters and blazers or worn alone. The 2 PLY design is extra smoothing and remains a customer favorite. Made of 90% Microfiber Nylon, 10% Lycra. The microfiber nylon and Lycra blend provides a smooth, supportive fit that moves with you, making it a great base layer for workouts or athleisure looks.
  • Underpinnings Tank Bra: This bra combines a sleek tank silhouette with the support of a bra. Fabric: 95% rayon, 5% spandex for a soft, stretchy fit. For low-impact activities like yoga or walking, this tank bra offers light support and coverage, reducing the need for extra layers.

Fit Guidance

Best for

  • High-sweat activities like running or cycling
  • Layering under workout clothes or as part of an athleisure outfit

Not for

  • Low-intensity lounging where cotton might be more comfortable
  • Those who prefer 100% natural fiber underwear for daily wear

Choosing the right underwear for working out comes down to fabric, fit, and the specific demands of your activity. Prioritize moisture-wicking materials and a secure, comfortable fit. With these tips, you can focus on your workout, not your underwear.