Vesuvius Sports Boxer
Vesuvius Sports Boxer
5" Inseam, 4" Deep Single Layer Caldera Pouch, with inverted StealthFly, 95% MicroModal/5% Elastane, Seamless Hems
Size Guide
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The Details
The Details
Let It All Hang.
Vesuvius Next Gen Sports Boxer features the all-new Caldera Pouch—an extra-large, single-ply front pouch that cascades down, providing a natural, unrestricted feeling, almost like being naked. To enhance this experience, our exclusive low-profile StealthFly ensures no accidental escapes and offers discreet, easy access.
Vesuvius Next Gen Sports Boxer is the most natural-feeling underwear you ever tried.
With a sporty 5" inseam and ultra low-profile seamless hems, they will stay put without pressure, invisible under your pants, and won't roll or bunch up.
Form-fitting ultra-premium 95% MicroModal fabric holds you softly and leaves you fresh all day.
Wide and ultra-smooth waistband won't flip or mark your skin.
Inseam: 5 inches
52 Wash Guarantee. Because we can.
1st Order Fit Guarantee
1st Order Fit Guarantee
Our number one goal is that you're happy with your purchase.
Try on a single pair and make sure it's perfect for you.
If you bought multiple pairs, make sure you try ONLY ONE PAIR for fitting purposes.
After this first pair, all underwear must be unworn, unwashed, in the original condition and packaging you received them in for a refund.
Due to the nature of our product we cannot accept returns of worn products. We will only be able to provide store credit for worn products limited to your first pair.
Please contact us directly at hello@krakatoaunderwear.com to discuss options.
52 Wash Guarantee
52 Wash Guarantee
We want you to feel confident making your purchase from us. We provide a 52 Wash Guarantee which is triggered by either 52 washes or 12 months from the date of purchase. If your item has any structural damage resulting from a manufacturer's defect before 52 washes or 12 months, we'll replace them for just the cost of shipping.
The guarantee excludes damage caused by neglect or abuse, by intentional damage, accidental damage, color fade, pilling, stains of any kind, and deliberate attempts to damage the product.
Applies to any product purchased, does not apply to any product provided as a replacement.
Send us an email at hello@krakatoaunderwear.com with the subject "52 Wash Guarantee Claim". Please be sure to include photos of the damage. We will be in touch shortly after.
Full details can be found HERE.

THE FEATURES YOU ASKED FOR
Every little detail was obsessively fine-tuned, to deliver you an underwear experience like no other:

THE CALDERA POUCH
Super Thin and Flexible, with StealthFly.
Elevate your comfort game with the all-new Caldera Pouch, designed for the ultimate in relaxation and ease. Slip into a world of barely-there comfort with our deep and low single-ply design, offering incredible flexibility and sensitivity. Experience a gentle embrace that feels like second skin, cradling your most delicate areas with care.
The new StealthFly is the exclusive horizontal fly from Krakatoa, incredibly easy to use and barely noticeable.

THE FINEST MICROMODAL FABRIC
Exceptional Softness and Breathability.
No synthetics here -and no PFAS.
Feel softness like never before with an ultra-premium, hand selected 95% MicroModal fabric. We source only the best MicroModal because comfort is our #1 goal. (Learn about MicroModal). We just add 5% of Spandex to allow for it to move with you.
We never skimp on the quality of our fabrics and materials, neither on the craftsmanship. These products go on your softest, most sensitive parts. We won't settle for anything less than the very best.

UNFLIPPABLE WAISTBAND
Art On Your Body.
Our waistbands are wide, smooth, don't leave marks, and are truly unflippable, offering a secure fit that prioritizes style and your comfort over branding. We focus on modern designs rather than flashy logos, framing your body beautifully.
Inside, you’ll find positive, self-affirming words designed to motivate you daily, inspiring you to be a better person to yourself, and to those around you.
Experience the perfect blend of style and substance with a waistband that uplifts and empowers you.

FLAT SEAMLESS HEMS
For Legs That Stay Put.
Seamless hems are a game-changer, offering unmatched comfort and a sleek look under any outfit. Their innovative design ensures they stay put without pinching or leaving marks, providing a smooth, barely-there feel against your skin.
Perfect for any activity, seamless hems eliminate visible lines, giving you a flawless silhouette even under the most form-fitting pants. Enjoy the freedom of movement and the confidence of a perfectly polished appearance with the low-profile seamless hems on Vesuvius Next Gen.
HEY ALEX, I HAVE QUESTIONS!
What's the Caldera Pouch?
Our new Caldera Pouch is a reimagined front pouch, featuring a U-shape design that offers a natural feel and relaxed support.
It's not designed for vigorous activities, because it's like you are Going Commando, but without sticking to your legs.
The innovative design gently cradles your genitals, allowing them to naturally fall into place for a super comfortable and natural fit.
Crafted from a single layer of our ultra-thin 95% MicroModal fabric, the Caldera Pouch offers a barely-there sensation while providing all-day comfort and breathability.
What should I know about the fit?
The Vesuvius Next Gen Sports Boxer is designed with a 5" inseam. The hems on the leg openings are seamless, for a stealthy look and supreme comfort, besides staying put all day.
They are long enough to cover enough of your legs to add a wide layer of protection from chafing, while still staying inside your shorts.
The Caldera Pouch is designed to be large enough to provide you a lot of elasticity and room, while being single-layered to provide a loose feeling like Going Commando.
What if I'm in between sizes?
Our sizes run pretty true and the materials do have stretch to them.
But if you're not sure which size is going to be the best for you, consider these three things:- Your waist in inches (pants size is OK).
- If your legs touch at the thighs.
- If you have a small, normal or large butt.
If your legs touch and your butt is large, you might jump a size.
If you have a small butt and thin legs, you can downsize.
What's MicroModal fabric?
In a word. Soft.
Really soft, our MicroModal is hand-selected to be of the highest grade available.
MicroModal is a modern technical fabric that is manufactured with cellulose from renewable Beechwood trees. Compared with Cotton, it's odor-resistant, 3 times softer, 50% more breathable, and it's not nearly as polluting or water-wasting.
Why such a big pouch?
Men come in all different shapes and sizes but for years underwear failed to respect our anatomy.
All Krakatoa Pouches are designed for the majority of men out there, to accommodate and coddle. It's a blend of being soft with some stretch where needed, but also supportive for all day comfort. You won't need to adjust yourself anymore, because sticking to your legs is a thing of the past.
When will my item ship? How long will it take to arrive?
Please allow 2-4 days for processing, and the usual shipping times from the USPS or UPS: inside the US you can expect to see your package between 3-6 days.
We'll send you a confirmation email with your tracking information as soon as it ships.
If you have any questions or don't receive an email, feel free to reach out via our Contact Us Page.
What is your returns and refunds policy?
All returns are available for 60 days following their delivery date.
We’re happy to accept any items that are unused, unopened, unworn, and in their original packaging.
WE ARE UNABLE TO ACCEPT ANY PRODUCTS THAT HAVE BEEN WORN.
We strongly encourage you to add shipping insurance and hassle free returns to your orders as it appears in the cart, especially if it’s your first order.
We strongly recommend that you only try on only one pair for sizing purposes.
You can start a return at any time in our Returns Portal.
Given the nature of our product, and for health and safety reasons, we are unable to provide exchanges at this time.
Buyer will be responsible for any associated return shipping costs.
How do I wash my Krakatoa?
Krakatoa is quite resistant to shrinking and fading, but machine-washing them in cold water using the delicate setting and drying in low heat will keep them looking fresher for longer.
Please do not bleach, iron, or dry clean your boxer briefs or trunks. You can also wash it by hand and lay it flat to dry, for great results.
What's your 52 Wash Guarantee?
We want you to feel confident making your purchase from us. We provide a 52 Wash Guarantee which is triggered by either 52 washes or 12 months from the date of purchase. If your item has any structural damage resulting from a manufacturer's defect before 52 washes or 12 months, we'll replace them for just the cost of shipping.
The guarantee excludes damage caused by neglect or abuse, by intentional damage, accidental damage, color fade, pilling, stains of any kind, and deliberate attempts to damage the product.
Applies to any product purchased, does not apply to any product provided as a replacement.
Send us an email at support@krakatoaunderwear.com with the subject "52 Wash Guarantee Claim". Please be sure to include photos of the damage. We will be in touch shortly after.
Full details can be found HERE.
WHICH SPORTS BOXER IS BEST FOR ME?
Each Krakatoa Collection comes with a specific pouch and hem.
While they all share the same absurdly soft fabric and unflippable waistband, their pouches and hems are what set them apart.
Here is a quick guide:
-
Learn MoreU-Shaped Caldera Pouch
Low-Profile StealthFly
Seamless Hems -
Learn MoreClosed, Lined StratoPouch
4" Sealed Pouch
Seamless Hems
CHECK OUR REVIEWS
See how we have impacted guys from all walks of life.
Our products are only as good as the impact they have on those that experienced them.
- Mike M.Verified BuyerRated 5 out of 5 starsThe Ultimate Boxers
As always, Krakatoa knocks it out of the park. Whether you're swinging a big bat or just have big baseballs, these are made for you. The Vesuvius line is the best pouch of any pouch-styled underwear that I've tried (and I've tried many). The bottom seem is pushed further back and lets everything just fall into place. It's the closest to feeling like you're freeballing. I have a few pairs of the longer Vesuvius, but was happy they made a middle length, and there's still zero issue with it rolling up. As always, the Krakatoa fabrics are comfortable and the construction is solid. Plenty of stretch in these even when there's some unexpected excitement. Thanks Krakatoa for looking out for the big boys.
FeaturedWas this helpful? - OliviaVerified BuyerRated 5 out of 5 starsA whole new way to look at white underwear!
Wow! My husband just got the new white Vesuvius Sports Boxer to add to his other colors in his drawer. And we love them. I never thought white underwear would look this good. Of course he likes the fit, comfort and support. And we both appreciate the softness. The new color is great. I love it when I see him around there house in just these briefs!
FeaturedWas this helpful? - Macsen V.Verified BuyerRated 5 out of 5 starsDeath to bat-winging and the constant need to adjust! One of the best pouch-style undies I’ve ever found!
I submitted a nearly identical review for the Vesuvius Trunks, but I find that I like the Vesuvius Sports Boxer more than the trunks because of the added leg coverage, which prevents chafing.
I’ve now ordered from Krakatoa 4-5 times. With each iteration they just keep improving!
The pouch on the Vesuvius line is superior to other brands (and earlier products from Krakatoa) because of how deep it is, and how far it extends toward the rear, back behind your balls. I find that my anatomy stays inside the pouch no matter which position I’m sitting or standing in, or how actively I am moving. That’s just not true of all but one other brand of pouch-style undies that I have found. The others I have tried are great for standing and walking, but as soon as I sat down or started moving around or bending at the hips to the extreme I’d fall out of the pouch and lose the benefit of having it. The comfort of the pouch is so great, especially while sitting down! It’s so nice to have a pouch that keeps things separated, yet supported 100% of the time, in all positions.
Other reasons why I love ‘em; The fit and finish is superior, the feel of the fabric is soft and supple, yet supportive, I don’t even notice the seams, and the waistband feels great and never rolls. Might be TMI, but there is ample room to accommodate “episodic growth” 😈 when things get exciting. No more feeling smashed / trapped / bent at a weird angle. And lastly, I love how sexy they make me feel….and look. Everything…
FeaturedWas this helpful? - JAMES B.Verified BuyerRated 5 out of 5 starsLike that naked feeling
These underwear are just like being naked, light as a feather, but good support. Love the hidden fly. I was a loyal Tommy John supporter, but will be switching
FeaturedWas this helpful? - Keyser S.Verified BuyerRated 5 out of 5 starsLife changing underwear
I stopped wearing underwear about 20 years ago because I could never find a brand/pair that I wanted to wear on a daily basis. They were always too tight, squishing down my girthy bulge into a flat hot pocket. Sure… if I was dressed nice for a business dinner, wedding, a formal event, or in a suit or some slacks I would wear/tolerate the underwear I had. But if I was in daily jeans or shorts I’d be free swinging. I tried various styles and fabrics and brands over the years. Always just throwing them out, until now. I then discovered Krakatoa and ordered a pair for every day of the week. My Krakatoa underwear are, without question, the only underwear I’ve enjoyed wearing on a daily basis in over 20 years. I’m a muscular 5’9” and 238 lbs. and have a 36” waste with 29” thighs. I wear the Vesuvius 1.5” in an XL and the Vesuvius 5” in an XL. And I genuinely can’t imagine wearing any other underwear again. Thanks for helping “my boys” find a home again.
FeaturedWas this helpful? - LaDarius W.Verified BuyerRated 5 out of 5 starsLove These!!
Spacious pouch and love the color and fit!! I'm a small and I ordered a small, so true to size!!
FeaturedWas this helpful? - OliviaVerified ReviewerRated 5 out of 5 starsFrom a woman's perspective
Not sure if women see these reviews or if men care, but I thought I'd share my thoughts. My husband bought the Vesuvius Sports Boxer briefs and I love them. He looks
magnificent in the Caldera pouch. Incredible. I just bought him 4 more. Just love the way these briefs highlight his amazing masculinity. Ladies, get these for your man. You'll love him for it!
FeaturedWas this helpful? - Carrie M.Verified BuyerRated 5 out of 5 starsAwesome
My husband loves the underwear! Wants to get more as soon as possible. He works for the railroad and he said with all the climbing and moving around he has to do, everything stayed in place!!
FeaturedWas this helpful? - David W.Verified BuyerRated 5 out of 5 starsThe best underwear for men I’ve found!
For years if not decades I’ve been trying to find the perfect men’s underwear. The briefs were rejected years ago because I didn’t like the constricted feeling of my genitalia being plastered up against my body. And they would tend to feel sweaty. So for decades I wore only loose cotton boxers. It was refreshing to not feel constricted and feel more ventilation in that area, but there was the constant irritation of my testicles sticking to my upper inner thighs. Every time I got up from a seated position, my hands would b e reaching to push my testicles of my upper inner thighs. And to make my situation worse, I was plagued by a chronic yeast/fungal infection that would not go away even with anti-fungal/yeast medicated creams being applied as directed for weeks on end. And this seemed to be related to the fact that there was no absorbing cloth between my testicles and my upper inner thighs with the boxers. So I tried the underwear associated with review with some hesitation because the videos on this brand of underwear used fabric which appeared to be quite stretchy and tight. And I was trying to avoid the feeling of constriction. However, my experience of wearing this underwear was much more enjoyable with it meeting all the goals that I was searching for in men’s underwear. The pouch was roomy. And once the genitalia was completely dropped into the pouch and the fabric was pressed up into the crease between my upper inner thigh and my scrotum, there was no more sticking…
FeaturedWas this helpful? - Eric B.Verified BuyerRated 5 out of 5 starsThe only thing you need
These boxers know their place in the marketplace. Number 1, and have cleared out all other brands from my dresser without question. Do yourself a favor and stop shopping around, purchase now.
FeaturedWas this helpful?