Mossimo Boxer Briefs

★★★★★4.8/5· thousands of reviews

Our Mossimo boxer briefs deliver the perfect balance of comfort, support, and durability for everyday wear. Designed with a soft cotton-blend fabric and a contoured pouch, these briefs move with you whether you’re hitting the gym or heading to the office.

We’ve engineered these boxer briefs with a tag-free design and smooth flatlock seams to eliminate irritation during all-day wear. The athletic-inspired fit provides coverage without bunching, while the elastic waistband stays in place without digging in.

  • Cotton-polyester blend fabric for softness and stretch
  • Contoured pouch design for enhanced support
  • Tag-free construction eliminates irritation
  • Flatlock seams prevent chafing
  • Elastic waistband with Mossimo logo
Cotton-polyester blend fabric for softness and stretchContoured pouch design for enhanced supportTag-free construction eliminates irritationFlatlock seams prevent chafingElastic waistband with Mossimo logo
Build quality
Everyday use
Value
Durability
Style

Fabric Composition & Construction Quality

Fabric Composition & Construction Quality

We craft Mossimo boxer briefs from a premium cotton-polyester blend that balances natural breathability with performance stretch. The cotton content keeps you cool and comfortable throughout the day, while the polyester adds durability and shape retention through countless washes.

Our flatlock seam construction eliminates the bulky ridges found in traditional underwear. These smooth seams lie flat against your skin, preventing the chafing and irritation that can occur during physical activity or extended wear. The tag-free design means nothing scratches or irritates the back of your waist.


Sizing Guide & Fit Details

Sizing Guide & Fit Details

Our Mossimo boxer briefs feature an athletic fit that hugs your body without restricting movement. The 6-inch inseam provides full coverage while preventing ride-up, whether you’re sitting at a desk or squatting at the gym.

We recommend ordering your standard underwear size for the best fit. The elastic waistband offers moderate stretch, accommodating waist sizes within each range comfortably. Sizes run from Small (28-30″ waist) through XXL (44-46″ waist).


Care Instructions & Durability

Care Instructions & Durability

Maintaining your Mossimo boxer briefs requires minimal effort thanks to their durable construction. Machine wash them in cold water with like colors using a standard detergent. We recommend avoiding bleach, which can break down the elastic fibers over time.

Tumble dry on low heat or hang dry to extend the life of the elastic waistband. The cotton-polyester blend resists shrinking when laundered properly, ensuring your boxer briefs maintain their original fit wash after wash.


Complete Your Underwear Drawer

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Mossimo Athletic Crew Socks
Cushioned crew socks with arch support and moisture-wicking performance.
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Mossimo V-Neck Undershirts
Mossimo V-Neck Undershirts
Soft cotton-blend undershirts that layer invisibly under dress shirts.
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Mossimo Compression Boxer Briefs
Mossimo Compression Boxer Briefs
Performance compression fit for high-intensity workouts and training.
View Compression →
Mossimo Lounge Pants
Mossimo Lounge Pants
Comfortable jersey knit pants with elastic waistband for relaxing at home.
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Mossimo Performance Trunks
Mossimo Performance Trunks
Shorter inseam trunks with the same comfort features as our boxer briefs.
View Trunks →
Mossimo Graphic T-Shirts
Mossimo Graphic T-Shirts
Classic cotton tees with modern graphics and comfortable relaxed fit.
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What people are saying

4.8
★★★★★
Based on verified reviews
Customer product photo
Customer product photo
Customer product photo
M
Marcus T.
Verified buyer
★★★★★
Best Value Underwear I’ve Found
I’ve been buying Mossimo boxer briefs for three years now and they still hold up better than premium brands. The fabric stays soft and the elastic doesn’t wear out. At this price point, you really can’t beat the quality.
D
David K.
Verified buyer
★★★★★
Comfortable All Day Long
I wear these to work and to the gym, and they never ride up or bunch. The tag-free design is a game-changer—no more irritation at my waistband. I bought the 5-pack and immediately ordered another set.
B
Brandon L.
Verified buyer
★★★★★
Perfect Fit and Great Support
The contoured pouch actually makes a difference compared to my old underwear. Everything stays in place without feeling compressed. I’m 6’2″ and the inseam length is perfect—no riding up my thighs.
J
Jason R.
Verified buyer
★★★★☆
Solid Everyday Option
These boxer briefs are exactly what I need for daily wear. Not too tight, not too loose, and they wash well. I’ve gone through about 20 wash cycles and they still look new. The price makes it easy to stock up.
C
Chris M.
Verified buyer
★★★★★
No More Expensive Brands for Me
I used to spend $25+ per pair on designer underwear. These Mossimo boxer briefs are just as comfortable at a fraction of the cost. The quality surprised me—they’re built to last and feel great.
T
Tyler W.
Verified buyer
★★★★★
Holds Up to Active Lifestyle
I’m a personal trainer and I’m constantly moving throughout the day. These boxer briefs breathe well, don’t chafe, and stay put during workouts. The flatlock seams really do prevent irritation during squats and lunges.

Common Questions About Mossimo Boxer Briefs

Our Mossimo boxer briefs feature a 6-inch inseam that provides full coverage without bunching or riding up. This length works well for most body types and prevents the fabric from creeping up your thighs during movement.

The leg openings are designed to stay in place comfortably throughout the day, whether you’re sitting, standing, or engaging in physical activity.

Mossimo boxer briefs run true to size with an athletic fit that follows your body’s contours without restriction. If you typically wear a Medium in most underwear brands, you’ll want a Medium in our boxer briefs.

The elastic waistband offers moderate stretch to accommodate slight size variations. Customers between sizes often prefer sizing up for a more relaxed fit, though the standard sizing provides comfortable support for most wearers.

Yes, you can tumble dry Mossimo boxer briefs on low heat without damaging the fabric or elastic. We recommend low heat rather than high to extend the life of the waistband and maintain the fabric’s shape.

For maximum longevity, hang drying is always the gentlest option. The cotton-polyester blend dries relatively quickly when air-dried, and this method helps preserve the elastic’s tension over time.

When laundered according to our care instructions, Mossimo boxer briefs resist shrinkage. Wash them in cold water and tumble dry on low heat to maintain their original size and fit.

The cotton-polyester blend is more shrink-resistant than 100% cotton underwear. If you accidentally wash them in hot water or dry on high heat, you may experience minimal shrinkage, but following the recommended care routine prevents this issue.

Mossimo boxer briefs work well for moderate exercise and daily gym sessions. The polyester content provides moisture-wicking properties that help keep you dry during workouts, while the four-way stretch fabric accommodates dynamic movement.

The contoured pouch and flatlock seams prevent chafing during activities like running, lifting, or cycling. For high-intensity training or competitive athletics, you may want to explore our compression boxer brief option, which offers additional performance features.

Our multi-packs include carefully coordinated assortments of classic colors. The 3-pack typically contains a combination of black, navy, and grey heather, while 5-packs add white and additional neutral options.

We rotate seasonal color releases throughout the year, occasionally featuring burgundy, olive, or other versatile shades. All colors are designed to coordinate with your existing wardrobe and won’t show visible wear as quickly as lighter shades.

With proper care, Mossimo boxer briefs maintain their supportive fit and comfort through 1-2 years of regular wear. The reinforced stitching and quality elastic extend their lifespan beyond many budget underwear options.

Customers report that the fabric holds its softness and the waistband retains elasticity through hundreds of wash cycles. Rotating between multiple pairs rather than wearing the same ones repeatedly helps extend the life of each pair in your collection.

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