How to Choose Underwear Size for Males in 2025

Finding the perfect underwear size is key to comfort, confidence, and health.
This guide covers everything you need to know—from measuring your body to picking the best fit for your shape and lifestyle.

Explore our men’s underwear size guide, discover the best underwear for different body types, and shop our full range of men’s underwear for the ultimate fit.

Our Products

-BOXER BRIEFS

-SPORT BRIEFS

-BIKINI BRIEFS

-LEGGINGS

-JOCKS

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 the Right Underwear Size Matters

Wearing the wrong size can lead to discomfort, chafing, and even health issues.
A perfect fit supports your body, boosts confidence, and keeps you comfortable all day.
The global men’s underwear market is expected to reach $16.5 billion in 2025, with more men than ever seeking the right fit for their unique shape.
Ill-fitting underwear can cause irritation, restrict movement, or slip down, making it hard to focus on your day.
The right size ensures discreet support, whether you’re working out or relaxing at home.

How to Measure for Men’s Underwear

Getting your measurements right is the first step to finding your perfect fit.

Waist Measurement:

• Wrap a soft measuring tape around your natural waist—just above your hips, where your underwear sits.

• Keep the tape snug but not tight. You should be able to slide a finger between the tape and your skin.

 Hip Measurement:

• Measure around the fullest part of your hips and buttocks.

• This helps if you have muscular thighs or a curvier shape.

 Thigh Measurement (for boxer briefs): 

• Measure around the thickest part of your thigh for extra accuracy.

Compare your measurements to the brand’s size chart—sizes can vary between brands, so always check before buying.

Choosing the Right Underwear by Body Type

Every body is unique, so finding the right fit means considering your shape and needs.

 Athletic Build:

• Muscular thighs and a defined waist.

• Consider boxer briefs for support and coverage.

• You may need to size up for thigh comfort.

Slim Build:

• Narrow waist and hips.

• Classic briefs or mid-rise boxer briefs work well.

Regular Build:

• Average proportions.

• Most styles fit well—focus on comfort and fabric.

Curvy or Plus Size:

• Wider hips and thighs.

• Look for wide waistbands and high-waisted briefs for extra support.

Rectangular Shape:

• Straight body shape.

• Lower-rise styles can be flattering.

Top Tips for Finding Your Perfect Fit

 Check the Waistband:

• It should stay in place without rolling or digging in.

Avoid Wedgies:

• Choose styles with enough coverage to prevent riding up.

Look for Stretch:

• Fabrics with spandex or elastane offer flexibility and comfort.

Try Different Styles:

• Briefs, boxer briefs, trunks, and jockstraps each fit differently—experiment to find your favorite.

Consider Your Lifestyle:

• Active men may prefer moisture-wicking fabrics and compression features.

Discover More About Us - RMAC 

1) RMAC - How to Choose Underwear Size for Male in 2025

At REAL Men Apparel Company, we understand the unique needs of basketball players. Our leggings are designed with your performance in mind:

REAL Pouch System: Our innovative pouch system ensures a perfect fit for every man, from size A to D. This customized fit provides unparalleled comfort and support during play.

Premium Materials: We use high-quality modal and nylon fabrics that offer excellent breathability and moisture-wicking properties.

Durable Construction: With reinforced stitching and high-quality materials, our leggings are built to last through countless games and practices.

How to Choose Underwear Size for Male 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:

• Tailored Pouch Sizes: Discover unmatched comfort and support with four customizable pouch sizes (A, B, C, D) designed just for you.

• Moisture-Wicking Modal: Our expertly crafted modal fabric whisks away moisture effortlessly, keeping you cool and dry in any situation.

• Sturdy Waistband: Enjoy the peace of mind that comes with a no-roll waistband, securing fit regardless of your movements.

• Irritation-Free Design: Say goodbye to annoying tags with our tagless design that enhances your comfort.

• 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:

• Composition: 92% Modal, 8% Spandex

• Machine wash cold

• Gentle cycle

• Avoid bleach

• 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:

• 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.

• Moisture-Wicking: Designed with moisture-wicking fabric, these briefs ensure you stay cool, dry, and fresh throughout the day.

• No-Roll Waistband: Enjoy the convenience of a medium-rise waistband that remains securely in place, preventing any rolling or bunching for optimal comfort.

• 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

• Material: Composed of 90% nylon and 10% spandex for ultimate comfort and durability.

• 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:

1. Tailored Fit: Choose from four customized pouch sizes (A, B, C, D), ensuring personalized support and comfort tailored to your needs.

2. Breathable Fabric: Crafted from lightweight nylon fabric, these briefs efficiently wick away moisture, keeping you cool and dry all day long.

3. Secure Waistband: Featuring a no-roll, low-rise waistband, these briefs promise a secure fit that won't roll or dig into your skin.

4. Tag-Free Comfort: Say goodbye to irritation with our tagless design, enhancing your comfort experience.

5. 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

• Machine wash in cold water

• Use a gentle cycle

• Avoid bleach

• 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:

1. Strapless Innovation: Enjoy unparalleled freedom and ease of movement with a strapless design that provides essential support without the cumbersome bulk of traditional jockstraps.

2. Breathable Performance Fabric: Crafted from a lightweight, moisture-wicking nylon-spandex blend, this fabric keeps you cool and dry throughout any activity.

3. Secure No-Roll Waistband: Experience all-day comfort with a waistband that stays securely in place, eliminating the need for constant adjustments.

4. 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

• Material Composition: 90% Nylon, 10% Spandex

• Care Instructions:

• Machine wash cold with like colors

• Avoid bleach

• Tumble dry on low

• 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

Underwear Trends for 2025

 Comfort is King:

• Fitted cuts, low-rise briefs, and long johns offer optimum support and freedom of movement.

Breathable Fabrics:

• Microfiber, modal, and bamboo blends keep you cool and dry.

Minimalist Designs:

• Clean lines, ultra-thin waistbands, and seamless finishes are in style.

Technological Fabrics:

• Anti-odor, thermoregulating, and moisture-wicking properties are popular.

 Sustainability:

• Eco-friendly materials and ethical production are important to modern men.

How to Avoid Common Underwear Problems

 Discomfort and Chafing:

• Choose the right fit and fabric—avoid being too tight or too loose.

 Wedgies:

• Pick styles with enough coverage and stretchy fabrics.

Rolling Waistband:

• Look for no-roll or wide waistbands.

Fabric Deterioration:

• Wash in cold water and avoid harsh detergents.

Sizing Issues:

• Always check the brand’s size chart before buying.

Expert Styling Tips

 Casual Look:

• Pair boxer briefs or trunks with jeans or shorts.

Workout Ready:

• Choose compression or moisture-wicking briefs for active days.

Layered Ensemble:

• Wear leggings under shorts for extra warmth and support.

FAQ

FAQ: How do I know if my underwear fits properly?

Your underwear should feel snug but not tight, with no pinching, rolling, or bunching.

FAQ: What should I do if my measurements are between sizes?

Choose the larger size for comfort or the smaller size for a snugger fit, depending on your preference.

FAQ: How often should I replace my underwear?

Replace every 6–12 months or when fabric loses shape, color, or elasticity.

👉 Discover Your Perfect Fit with REAL Men Apparel Company