Quick answer
For most workouts, choose a sport brief or seamless underwear that stays put and avoids visible lines under leggings. If you're running or prefer minimal coverage, a sport thong is a solid option, but a brief offers more coverage and security for strength training and yoga.
The right underwear can make or break a workout. Whether you're hitting the gym, going for a run, or stretching in yoga class, the wrong pair can cause chafing, bunching, or visible lines. This guide will help you pick the best underwear for exercise based on your activity, fit preferences, and the type of bottoms you wear.
We'll break down the differences between sport briefs and thongs, explain why seamless and breathable fabrics matter, and give you practical rules for choosing underwear that works with leggings, shorts, and more. You'll also learn what to look for in a pair—so you can shop with confidence.
Sport Brief vs. Thong: Which is Better for Workouts?
The classic debate comes down to coverage versus minimalism. A sport brief, like the Amber Sport Brief, offers a classic rise and reliable coverage that stays put during movement. It's a great choice for activities where you want extra security, like strength training, cycling, or high-impact classes. Briefs also provide more fabric, which can help prevent chafing if you're prone to it.
Amber Sport Brief
A sport thong, on the other hand, offers minimal coverage and eliminates visible panty lines under tight leggings. It's a popular pick for running and yoga, where a brief might bunch or create lines. However, thongs may not be as comfortable for everyone, and they offer less coverage if you're doing deep squats or lunges. The choice really depends on your personal comfort and the activity.
- If you're doing heavy lifting or prefer more coverage, a sport brief is a safer bet.
- For running or wearing high-waisted leggings, a thong can be more comfortable and invisible.
Key Features to Look For in Workout Underwear
When choosing underwear for exercise, focus on three things: fabric, fit, and function. Look for breathable, moisture-wicking materials that keep you dry—cotton can become heavy and uncomfortable when sweaty. Seamless or nearly seamless designs reduce friction and visible lines, making them ideal for leggings and tight shorts.
Fit is equally important. Underwear that's too tight can dig into your skin, while loose styles may shift or bunch. A classic-rise brief, for example, offers a balanced fit that stays put without feeling restrictive. Also consider the waistband: a foldover or high-rise design can work well with high-waisted leggings, while a low-rise option might be better for lower-cut bottoms.
- Opt for sweat-wicking fabrics like nylon or polyester blends.
- Seamless styles are your best bet for no-show lines under leggings.
Matching Underwear to Your Workout
Different activities demand different features. For running, you want underwear that won't ride up and is breathable—a thong or a seamless brief with a secure fit works well. For yoga and Pilates, comfort and flexibility are key, so a brief with a classic rise or a seamless thong can move with you without bunching.
For strength training and CrossFit, you need support and coverage. A sport brief with a secure waistband and enough fabric to stay in place during squats and lunges is ideal. If you're wearing compressive leggings, you'll want underwear that doesn't create visible lines—seamless styles are your friend. The Terrace High-Rise Run Short, for instance, is designed to be sheer-proof, so you can wear a thong or brief underneath without worry.
Terrace High-Rise Run Short
- Running: choose breathable, moisture-wicking thongs or seamless briefs.
- Yoga: go for flexible, no-bunch styles like a classic-rise brief.
- Strength training: pick a sport brief for coverage and security.
Underwear for Leggings: No-Show Solutions
One of the most common complaints is visible panty lines under leggings. The solution is seamless underwear or a thong. Seamless styles are designed to lie flat against your skin, so they disappear under tight fabrics. The Amber Sport Brief, while not seamless, offers a classic rise that can work with higher-waisted leggings if you prefer more coverage.
Another option is to choose underwear with a similar color to your leggings to minimize contrast. But the best approach is to pick a style that's specifically designed to be invisible. If you're wearing a compressive legging like the Dragonfruit Foldover Legging, a seamless thong or brief will keep your silhouette smooth and prevent any bunching or lines.
- Seamless underwear is the best no-show option for leggings.
- If you prefer briefs, choose a style with flat edges and a secure fit.
Breathability and Chafing Prevention
Breathable underwear is essential for any workout, especially running or high-intensity sessions. Look for fabrics that wick moisture away from your skin, like the compressive, sweat-wicking material used in the Terrace High-Rise Run Short. This helps keep you dry and reduces the risk of chafing.
Chafing can also be caused by seams and friction. Choosing underwear with flat seams or a seamless design can minimize irritation. If you're prone to chafing, consider a sport brief with a classic rise that stays put, reducing the movement that causes friction. And don't forget to choose the right size—underwear that's too small can cause rubbing, while too large can bunch and create friction.
- Prioritize moisture-wicking fabrics to stay dry and prevent chafing.
- Flat seams and seamless designs reduce friction during movement.
Quick Decision Rules for Workout Underwear
- Activity type: For high-impact running or cardio, choose a thong or seamless brief to minimize lines and chafing. For strength training and yoga, a sport brief with classic rise offers coverage and security. Match underwear to the movement intensity.
- Bottoms you wear: If you wear tight leggings or shorts, pick seamless or thong styles to avoid visible lines. For looser shorts or skirts, a brief can work without showing. Think about what you'll wear on top.
- Fabric and breathability: Look for moisture-wicking, breathable materials that keep you dry. Avoid cotton for intense workouts as it holds sweat and can cause chafing. Stay dry to stay comfortable.
Products That Help You Choose
- Amber Sport Brief: The Amber Sport Brief from Girlfriend Collective is a classic-rise brief designed to stay put during your workout. It's part of the Intimates collection and available in a warm amber color. If you prefer briefs for coverage and security, this style is built to stay in place during exercise, so you won't have to adjust mid-workout.
- Terrace High-Rise Run Short: The Terrace High-Rise Run Short is designed for your run with a sweat-wicking, sheer-proof compressive fit, featuring an ultra-high rise and a 4.75” inseam. If you're a runner, these shorts are made to keep you dry and covered, so you can focus on your pace without worrying about chafing or transparency.
Fit Guidance: Who Should Choose What
Best for
- Runners and cardio lovers who want minimal lines and breathability – a seamless thong or brief works best.
- Strength trainers and yoga practitioners who prefer coverage and security – a sport brief like the Amber Sport Brief is ideal.
Not for
- If you dislike thongs or need extra coverage for deep squats, a sport brief is a better choice than a thong.
Choosing the right underwear for your workout comes down to activity, fit, and fabric. Prioritize breathable, moisture-wicking materials, and pick a style that stays put and feels comfortable. Whether you opt for a sport brief for coverage or a thong for minimal lines, the best choice is one that lets you move with confidence. Use the decision rules above to make your next purchase a no-brainer.
