Let’s cut to the chase: your gym performance hinges on what’s under your shorts. Ill-fitting underpants can sabotage squats, deadlifts, and even recovery. In 2025, the game has changed. Advanced fabrics, anatomical designs, and science-backed support systems now let you train harder, longer, and smarter.
This isn’t just about comfort—proper underpants prevent injuries, reduce chafing, and keep you dry during high-volume sets. Below, we break down what makes modern bodybuilding underwear revolutionary and how to pick the right pair.
When innovation meets anatomy, today's best men's bodybuilding underwear features compression zones engineered for explosive lifts and multi-directional stretches. Breathable, antimicrobial fabrics now wick sweat 40% faster than traditional cotton blends while maintaining structural integrity under heavy loads. The science of performance underwear reveals tapered leg openings prevent ride-up during depth squats, and flatlock seams eliminate abrasive pressure points across hip flexors. For lifters prioritizing both biomechanics and recovery, these advancements mean zero distractions from warm-ups to PR attempts.
Our Products
Try RMAC Today!
If you're interested in experiencing the comfort and style of RMAC underwear, visit our store to explore our collection and take advantage of our Best Fit Quiz to find your perfect fit.
Why Bodybuilders Need Specialized Underpants
Performance Impact
Research shows that 73% of lifters report discomfort from poor-fitting underwear during compound movements like squats. Standard options compress, ride up, or trap sweat—distractions that break focus and form.
Specialized designs solve this with:
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Targeted compression for muscle stabilization
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4-way stretch fabrics for unrestricted mobility
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Strategic ventilation zones to manage heat
Recovery Matters
Sweat-soaked cotton breeds bacteria, increasing post-workout irritation. Moisture-wicking fabrics like nylon and polyester dry 3x faster, reducing skin breakdown risk.
Key Features for 2025 Bodybuilding Underwear
1. Fabric Technology
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Nylon/Spandex Blends: 87% faster moisture evaporation than cotton.
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Modal: Silk-like softness with 4x breathability for long sessions.
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Anti-Odor Treatments: Silver-ion coatings inhibit bacteria growth.
2. The 4-Size Pouch System
Forget one-size-fits-all. Leading brands now use A-D pouch sizing to match anatomy:
|
Pouch Size |
Best For |
|
A |
Light support (cardio, mobility drills) |
|
B |
Moderate lifts (bench press, machines) |
|
C |
Heavy compound lifts (squats, deadlifts) |
|
D |
Competition prep (extended endurance training) |
This customization prevents “spillage” during deep squats while eliminating restrictive compression.
3. Anti-Chafing Engineering
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Laser-cut seams: Reduce friction points by 40%.
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Gusseted crotches: Added breathability for marathon leg days.
Best Men’s Underpants for Bodybuilding in 2025
RMAC - Best Underpants for Hot Weather in 2025
Modal 7in Boxer Briefs No Fly 6pk Black/Dark Gray/Navy
Description (Modal 7in Boxer Briefs No Fly 6pk Black/Dark Gray/Navy):
Features:
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Tailored Pouch Sizes: Discover unmatched comfort and support with four customizable pouch sizes (A, B, C, D) designed just for you.
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Moisture-Wicking Modal: Our expertly crafted modal fabric whisks away moisture effortlessly, keeping you cool and dry in any situation.
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Sturdy Waistband: Enjoy the peace of mind that comes with a no-roll waistband, securing fit regardless of your movements.
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Irritation-Free Design: Say goodbye to annoying tags with our tagless design that enhances your comfort.
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Unrestricted Flexibility: With a blend of nylon and spandex, these briefs adapt to your every move, providing all-day comfort without chafing.
Description:
Gentlemen, elevate your underwear experience with our Real Men Boxer Briefs—crafted to embrace your assets with divine comfort. Choose from four tailored pouch sizes (A, B, C, D) that offer a bespoke fit and redefine traditional underwear standards. Why settle for the ordinary when you can pamper your crown jewels with the luxury they truly deserve? Upgrade to a life of freedom and comfort—it's time to let your confidence soar!
Product Care:
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Composition: 92% Modal, 8% Spandex
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Machine wash cold
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Gentle cycle
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Avoid bleach
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Tumble dry on low
Discover Also:
-Nylon Seamless 7in Boxer Briefs No Fly 3pk Black/Heather Gray/Slate Green
-Nylon 9in Boxer Briefs V-FLY 3pk Black
-Modal 7in Boxer Briefs No Fly 3pk Black/Blue/Gray
-Modal 7in Boxer Briefs V-FLY 3pk Black/Cyan/Gray
-Modal 3in Boxer Briefs No Fly 3pk Heather Gray/Slate Gray/White
-Click here to see more Boxer Briefs
Nylon 0in Sport Briefs No Fly 4pk Blue/Gray/Dark Blue/Dark Gray
Description (Nylon 0in Sport Briefs No Fly 4pk Blue/Gray/Dark Blue/Dark Gray):
Features:
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Custom Fit: Experience a personalized fit with our sport briefs, available in four pouch sizes (A, B, C, D) to perfectly suit your body’s contours.
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Moisture-Wicking: Designed with moisture-wicking fabric, these briefs ensure you stay cool, dry, and fresh throughout the day.
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No-Roll Waistband: Enjoy the convenience of a medium-rise waistband that remains securely in place, preventing any rolling or bunching for optimal comfort.
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Flexible Support: Crafted from stretchy materials, these briefs provide the ideal combination of support and flexibility to move with you during any activity.
Description:
Ladies and gents, get ready to rev up your comfort with Real Men Sport Briefs, engineered to elevate your daily wear to a whole new level. Offering four pouch sizes (A, B, C, D), these briefs are tailored like a trusted pit crew, ensuring your prized possession is both supported and comfortable. Slip into unmatched comfort and performance—winning the Daytona 500 of comfort with each wear. Say goodbye to mundane underwear and hello to a whole new kind of champion-level comfort.
Product Details
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Material: Composed of 90% nylon and 10% spandex for ultimate comfort and durability.
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Care Instructions: Machine wash cold, use a gentle cycle, avoid bleach, and tumble dry on low for long-lasting wear.
Discover Also:
-Modal 0in Briefs No Fly 3pk Blue/Gunmetal Gray/Heather Gray
-Modal 0in Briefs No Fly 3pk Pink/Purple/Turquoise
-Click here to see more Briefs
Nylon 0in Low-Rise Bikini Briefs No Fly 3pk Black/Gray/White
Description (Nylon 0in Low-Rise Bikini Briefs No Fly 3pk Black/Gray/White):
Key Features:
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Tailored Fit: Choose from four customized pouch sizes (A, B, C, D), ensuring personalized support and comfort tailored to your needs.
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Breathable Fabric: Crafted from lightweight nylon fabric, these briefs efficiently wick away moisture, keeping you cool and dry all day long.
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Secure Waistband: Featuring a no-roll, low-rise waistband, these briefs promise a secure fit that won't roll or dig into your skin.
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Tag-Free Comfort: Say goodbye to irritation with our tagless design, enhancing your comfort experience.
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Flexible Movement: The combination of ice silk nylon and spandex allows freedom of movement, preventing chafing or riding up, so you can move effortlessly.
Product Care Instructions:
Material Composition: 90% Nylon, 10% Spandex
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Machine wash in cold water
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Use a gentle cycle
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Avoid bleach
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Lay flat to dry
Discover Also:
-Modal 0in Bikini Briefs No Fly 3pk Black/Blue/Gray
-Modal 0in Low-Rise Bikini Briefs No Fly 3pk Emerald/Purple/Red
-Modal 0in Bikini Briefs No Fly 1pk Black
-Nylon 0in Mesh Bikini Briefs No Fly 3pk Black/Blue/Gray
-Click here to see more Bikini Briefs
Nylon 0in Strapless Jocks No Fly 3pk Red/Green/Purple
Description (Nylon 0in Strapless Jocks No Fly 3pk Red/Green/Purple):
Features:
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Strapless Innovation: Enjoy unparalleled freedom and ease of movement with a strapless design that provides essential support without the cumbersome bulk of traditional jockstraps.
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Breathable Performance Fabric: Crafted from a lightweight, moisture-wicking nylon-spandex blend, this fabric keeps you cool and dry throughout any activity.
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Secure No-Roll Waistband: Experience all-day comfort with a waistband that stays securely in place, eliminating the need for constant adjustments.
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Flexible Comfort: The stretchy fabric moves seamlessly with you, offering flexibility while preventing chafing or irritation for ultimate comfort.
Description:
Get ready for a game-changer, gentlemen! Introducing the Real Men Strapless Jocks - redefining comfort and support without the hassle of straps. Slip into these jocks to experience the blissful feeling of having your assets comfortably supported, liberating you from the confines of traditional jocks. Say goodbye to outdated styles and hello to freedom!
Product Details
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Material Composition: 90% Nylon, 10% Spandex
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Care Instructions:
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Machine wash cold with like colors
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Avoid bleach
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Tumble dry on low
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Cool iron if needed
Discover Also:
-Nylon 0in Strapless Jocks No Fly 1pk Gunmetal Gray
-Nylon 0in Strapless Jocks No Fly 1pk Cyan
-Nylon 0in Strapless Jocks No Fly 1pk Red
-Nylon 0in Strapless Jocks No Fly 1pk Purple
-Click here to more Jocks
Discover our best Leggings
Mack Weldon AIRKNITx Boxer Briefs
These boxer briefs are made from a lightweight, breathable fabric that wicks moisture effectively, keeping you cool and dry during workouts. The seamless design minimizes chafing, and the snug fit offers excellent support without restricting movement.
Under Armour Performance Tech Boxerjock
Designed with athletes in mind, these boxer briefs feature quick-dry, moisture-wicking material and a four-way stretch construction for enhanced mobility. The ergonomic design provides ample support, making them ideal for bodybuilding sessions.
Saxx Kinetic Boxer Briefs
Known for their BallPark Pouch design, Saxx offers excellent support and reduces friction. The moisture-wicking, quick-drying fabric and semi-compression fit make these boxer briefs suitable for high-intensity workouts.
Nike Pro Compression Shorts
While technically compression shorts, they function similarly to boxer briefs and are popular among bodybuilders. They offer a tight fit for muscle support, moisture-wicking Dri-FIT technology, and mesh panels for added ventilation.
Gymshark Men's Boxers
Specifically designed for workouts, Gymshark's boxers feature ultra-soft, stretchy fabrics that provide support and reduce uncomfortable bunching under gym clothes. The stay-put waistband ensures they remain in place during intense movements.
How to Choose Your Size
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Measure Your Waist: Snug but not tight (use a tailor’s tape).
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Pouch Fit Test:
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Sit in a deep squat—no pinching or overflow.
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Jumping jacks—zero ride-up.
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Fabric Check: Hold it to light—if you see through it, it’s too thin for heavy sweat.
Try RMAC Today!
If you're interested in experiencing the comfort and style of RMAC underwear, visit our store to explore our collection and take advantage of our Best Fit Quiz to find your perfect fit.
