How to Choose the Perfect Underwear for Your Workout

Quick Answer

For workouts, choose underwear made from breathable, moisture-wicking fabrics like TENCEL, with a full-coverage gusset to prevent chafing. Opt for a style that stays in place during movement—thongs for minimal lines or cheeky cuts for coverage without wedgies.

When you're sweating through a HIIT class or logging miles, the last thing you want is underwear that rides up, traps moisture, or causes chafing. The right pair can make or break your workout, but with so many options, how do you choose? This guide breaks down what to look for in athletic underwear, from fabric to fit.

We'll cover the key features that matter most for exercise—breathability, moisture management, and coverage—and offer practical decision rules to match your activity level. Whether you're a gym regular or a weekend warrior, these tips will help you find comfortable, supportive underwear for your workout.

Fabric Matters: Breathability and Moisture Wicking

The fabric of your underwear is the most critical factor for workouts. Cotton absorbs sweat and stays damp, which can lead to irritation and discomfort. Instead, look for moisture-wicking materials that pull sweat away from your skin and dry quickly. TENCEL, derived from trees, is a standout choice for its breathability and softness—it's both eco-friendly and performance-oriented.

When shopping, check the label for synthetic blends like nylon or polyester, which are known for moisture-wicking properties. However, these can sometimes trap heat. TENCEL offers a natural alternative that feels soft against the skin while managing moisture effectively. For high-intensity workouts, prioritize fabrics that offer both stretch and breathability to keep you cool and dry.

• Check for 'moisture-wicking' or 'breathable' claims on the label.
• Avoid 100% cotton for intense exercise; reserve it for low-sweat days.

Coverage and Gusset: Preventing Chafing and Slips

A full-coverage gusset is a game-changer for workouts. This refers to the cotton or fabric panel at the crotch, and when it's wide enough to cover the entire area, it prevents 'lip slips' and reduces friction. Look for underwear that features a full-coverage gusset, especially if you're prone to chafing during runs or cycling.

The gusset's fabric also matters. Some brands knit their gussets with antimicrobial properties, like zinc oxide, which can help keep you fresher during long gym sessions. This is a thoughtful touch for active wear, as it addresses odor and moisture at the source. When trying on underwear, do a quick squat check to ensure the gusset stays in place and doesn't shift.

• Do a squat test in the fitting room to check for gusset movement.
• Look for gussets that are described as 'full coverage' for added security.

Style Selection: Thongs vs. Cheeky vs. Briefs

The style you choose depends on your workout and personal preference. Thongs are ideal for avoiding visible panty lines under leggings, and they minimize fabric that can bunch. For activities like yoga or Pilates, a seamless thong can offer a second-skin feel. On the other hand, cheeky styles provide more coverage while still flattering your shape, making them a good middle ground.

For high-impact activities like running or CrossFit, you might prefer a style with more coverage, such as a brief or boy short, to prevent wedgies. However, these styles can sometimes create lines. Consider your outfit and activity: if you're wearing loose shorts, a cheeky cut works well; for tight leggings, a thong is often the go-to.

• Thongs: best for no VPL and low-fabric feel.
• Cheeky: good balance of coverage and style.
• Briefs: maximum coverage, but may show lines.

Seams and Waistbands: Comfort in Motion

Seams can be a source of irritation during workouts, especially if they're thick or placed where they rub against your skin. Look for underwear with flat or flexible seams, like a zigzag stitch, which moves with your body and reduces chafing. Seamless options are even better for a frictionless experience, but they can sometimes lack structure.

The waistband should sit comfortably without digging in. A soft, cuffed waistband is a good choice for workouts because it stays in place without pressure. High-rise options offer extra support and coverage, which some women prefer for core-focused exercises. Try different rises to see what feels most secure during movement.

• Flexible zigzag stitches are less likely to irritate.
• Seamless styles offer zero friction but may not provide as much shaping.

Decision Rules for Workout Underwear

• Activity Intensity: For low-impact activities like yoga or walking, prioritize comfort and breathability. For high-impact workouts like running or HIIT, choose styles with more coverage and secure waistbands. Match your underwear to the intensity of your workout.
• Fabric Choice: Select moisture-wicking fabrics like TENCEL or synthetic blends. Avoid cotton for sweaty sessions. Check for breathability claims. Moisture-wicking is non-negotiable for gym wear.
• Gusset Coverage: Look for a full-coverage gusset to prevent chafing and slips. This is especially important for activities that involve a lot of movement. Full-coverage gussets keep you comfortable and secure.
• Style and Lines: If you wear tight leggings, a thong avoids VPL. For looser bottoms, a cheeky or brief style offers more coverage. Consider your outfit. Choose a style that matches your workout wardrobe.
• Seams and Waistbands: Opt for flexible or seamless seams to reduce chafing. A soft, non-digging waistband ensures comfort during movement. Comfortable seams and waistbands are essential for focus.

Product Features to Look For

• Low Profile Thong 3-Pack: A three-pack of our fan-fave Low Profile Thong. A super-sleek, low-mid rise staple without any unnecessary bells and whistles. Lined throughout for a body-hugging feel and secured with a flexible zig zag stitch, this smooth & supportive thong is an everyday essential. Made with super-soft, tree-derived TENCEL fibers known for their breathability. Our signature gusset is full coverage (no lip slips!) and knitted... The flexible zigzag stitch and full-coverage gusset make this thong a reliable choice for workouts where you need no-fuss coverage and minimal chafing.
• Seamless High Rise Thong: Seamless undies in breathable fabrics? They said it couldn’t be done! The Seamless High Rise Thong is made with our tried-and-true cellulose fibers, but in an extra stretchy construction that looks (and feels) like a second skin. With bonded edges, a supportive waistband, and a super-flattering high rise. Made with ultra-breathable TENCEL fibers known for their soft, frictionless feel. Our seam-free, full coverage... The seamless construction and high rise offer a frictionless, secure fit—ideal for yoga, Pilates, or any workout where you want zero lines and no shifting.

Fit Guidance

Best For

• Athletes who prioritize no visible panty lines under leggings.
• Those who want a breathable, moisture-wicking option for intense gym sessions.

Not For

• People who prefer full coverage and dislike thongs.
• Those who need extra support for high-impact sports like running.

Choosing the right underwear for your workout is about balancing breathability, coverage, and comfort. Focus on moisture-wicking fabrics, full-coverage gussets, and a style that suits your activity. With these tips, you can stay comfortable and confident through any sweat session.