White boxer briefs with a patterned waistband on a white background

Pinatubo Seamless Sports Boxer

Alpine White / Waist 28"-30" (XS)
$ 34.00 USD
$ 34.00 USD $ 34.00 USD
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White boxer briefs with a patterned waistband on a white background
  • White boxer briefs with a patterned waistband on a white background
  • Red boxer briefs with a patterned waistband on a white background
  • Blue boxer briefs with a brand logo on a white background
  • PInatubo Seamless Boxer Brief in Jet Black - Front
  • PInatubo Seamless Boxer Brief in Soapstone Green - Front
  • Pinatubo Sports Boxer Back View
  • Pinatubo Sports Boxer inside-out showing front view
  • Pinatubo Boxer Brief inside-out showing pouch
  • Pinatubo Boxer Brief inside-out showing printed washing label
  • Pinatubo Boxer Brief inside-out showing seamless hems
  • Yellow tennis ball in a white pocket with text overlay on a gray background
  • Video showing pinatubo's pouch
Pinatubo Seamless Sports Boxer

Pinatubo Seamless Sports Boxer

4.8
Rated 4.8 out of 5 stars
511 Reviews
$ 34.00 USD
$ 34.00 USD $ 34.00 USD
  • 5” Inseam
  • Horizontal Fly
  • 3” Deep Double Lined Pouch
  • 95% MicroModal / 5% Elastane
  • Seamless Leg Hems
ColorAlpine White
Size
3-Pack
$ 102.00 $ 86.70
Save $ 15.30
5-Pack
$ 170.00 $ 136.00
Save $ 34.00
7-Pack
$ 238.00 $ 178.50
Save $ 59.50

Savings are calculated for the current product being viewed.

Free Ground Shipping on Orders over $150

We do our best to process orders within 1-2 business days. Please keep in mind that over busy times this might take longer.
Mix match and save 3+ is 15%, 5+ is 20%, 7+ is 25%
Fit
  • Midrise
  • Form-fitting
First Fit Guarantee

1st Fit Guarantee

We want you to find the perfect fit.

Try on a single pair of underwear and make sure it's perfect for you.

If you bought multiple pairs, make sure you try ONLY ONE PAIR for fitting purposes.

NOT ONE PER STYLE OR LINE.

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.
1 Year Warranty

1 Year Warranty

We want you to feel confident making your purchase from us. We provide a 1 Year Warranty from the date of purchase. If your item has any structural damage resulting from a manufacturer's defect from 1 year of purchase, 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 "1 Year Warranty Claim". Please be sure to include photos of the damage for our records.

We will be in touch shortly after.

Full details can be found HERE.
Specs & Features

5" Inseam

Mid-length inseam that works well under running shorts and great for guys less than 5'10" or shorter legs.

Horizontal Fly

Easy access horizontal fly that makes it a breeze to access your parts.

3" Deep Pouch

3" deep pouch that provides plenty of room and support.

95% MicroModal / 5% Elastane

The perfect blend of soft, yet structured to ensure that it maintains shape all day and doesn't stretch out.

Lay Flat Waistband

1.5" wide lay flat waistband that will not roll, bunch, or pinch.

Seamless Hems

Hems designed to stay tight all day and not loosen as the day goes on from movement. No one likes legs that ride up.
Materials & Care Instructions

95% MicroModal 5% Elastane

Care Instructions

Machine Wash Cold, Gentle Cycle, Do Not Bleach, Tumble Dry Low, Do Not Iron
Returns and Exchanges

Returns & Exchanges

We except returns on all unopened and sealed products within 60 days from purchase.

ALL INTRO PAIR ORDERS ARE FINAL. NO RETURNS OR EXCHANGES.

WHAT SETS US APART

Every little detail was obsessively fine-tuned, to deliver you an underwear experience like no other:
Up close of Pinatubo underwear Fly in purple.

FULL SUPPORT WITH A FLY
Putting the Fun in Functional

Pinatubo’s 3” deep pouch design with minimal stitching keeps you comfortable and secure all day.
The one-handed, top-access horizontal fly provides effortless reach into the goods.
The low-stitching 3" pouch is ultra-smooth, without holes, panels or gimmicks.
It just works.
It separates you from your thighs, ensuring comfortable support through all of life’s adventures.
micromodal v. cotton macro photo comparison

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 Tencel 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.
Colorful waistbands in a square image.

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.
Close up of seamless hems

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.
4.8
Rated 4.8 out of 5 stars
Based on 511 reviews
Total 5 star reviews: 451 Total 4 star reviews: 40 Total 3 star reviews: 12 Total 2 star reviews: 5 Total 1 star reviews: 3
96%would recommend this product
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511 reviews
  • Jay R.
    Verified Buyer
    Rated 5 out of 5 stars
    So comfortable

    These are my favorite color and style of underwear wear . Will never wear another .

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  • Michael D.
    Verified Buyer
    Rated 5 out of 5 stars
    No roll waistband and amazing comfort!

    I love these underwear!! They are incredibly soft and comfortable and not binding even though I've put on a few pounds since I started wearing them. But, the greatest thing about these underwear is that the waistband does not roll over AND it's still comfortable, my stomach roll doesn't roll it down. This was what I was looking for! I just ordered 4 more pair. I can't wait until my whole underwear drawer is filled with Pinatubo from Krakatowa. Thanks for creating an amazingly comfortable garment.

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  • Kurt R.
    Verified Buyer
    Rated 5 out of 5 stars
    I Love Pinatubo Style!

    With all of the Krakatoa underwear that I have bought, I’ve learned that Pinatubo is the best style for me! Absolutely LOVE every Pinatubo model I have purchased! From the trunks, to the thongs and the others in between, Pinatubo are the BEST! The comfort of the material is so soft! The size of the pouch is perfect for me! The horizontal fly is the easiest access when needed! I have exclusively changed my underwear drawer to Krakatoa!!! Nothing else compares to these underwear, NOTHING!

    Thanks for creating such a wonderful product!

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  • Dan M.
    Verified Buyer
    Rated 5 out of 5 stars
    Best underwear in my 60+ years on this planet!

    The fabric is amazing. It is soft, movable and breathable the fit once I asked for help with your sizes you helped me out right away and it is probably one of the best fits I’ve ever had now for the features. The ball pouch works like no other and believe me I have the ones with the flaps. I have the ones with other features. Nothing works like this. I am very glad I got these. They are in heavy rotation and as soon as I can afford some more. I will get some more thanks!

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  • Corey B.
    Verified Buyer
    Rated 5 out of 5 stars
    Luxurious comfort... superb support!

    I can't rave enough about these Pinatubo seamless sports boxers! I've been pretty dedicated to either Under Armour or Tommy Johns for several years, but got so frustrated at how the sizes never stayed consistent, nor the same fit. But these (3rd ordered now...) have the best balance of comfort & support I've ever worn! The material is luxurious and sexy - maybe little too much, as I'm aroused a bit every time I think about how perfect the boys are nestled in place. The fly is THE perfect design for many reasons 😉

    Keep up the good work guys!

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  • Butch A.
    Verified Buyer
    Rated 5 out of 5 stars
    A better Life

    Alex, I bought my first pair of sports boxers from you several tears ago. I'd been looking for something better but the price scared me off. I was amazed at the feel and fit of them. I only wore them when we were going out or on special occasions. . I finally decided I'm worth the price. I love wearing them every day, the feel of the fabric the way they fit. Thank you for how hard you work to make them just right. Also I really enjoy your Wednesday news letter. Keep writing. Thanks for everything. Butch

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  • SEAN W.
    Verified Buyer
    Rated 5 out of 5 stars
    A Returning Customer—After A Long While

    So I'll admit: I ditched Krakatoa for a bit. I tried other brands. A lot of them. The quality just wasn't the same. One brand wasn't comfortable and rode up constantly. Another was kinda scratchy and just didn't feel good. The last one was good until they started to literally fall apart after just a few months.

    Krakatoas are different. Special. Comfy, well-put-together, breathable, the works. I don't need to reiterate the marketing: just go read it—it's all true. I bought three in black and plan to buy three more once the red is back in stock!

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  • Henry
    Verified Buyer
    Rated 5 out of 5 stars
    Amazing customer service

    I've got an athletic build that is hard to fit - I've tried over a dozen different companies. Alex took time to personally help me to try to find the best fit for me. I truly appreciate him going over the top to provide the best customer experience possible. Please support this awesome company!

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  • Greg M.
    Verified Buyer
    Rated 5 out of 5 stars
    Nice Boxers

    So I have worn and washed these a couple of times now and they are one of the most comfortable boxers I have ever worn. Just for fun this year I ordered one pair of boxers from several of the up and coming brands to see what I have been missing if anything when it comes to my boxers (worn the same brand since college). Well I am happy to say that your brand is one of the top if not the top brand out of all of them I have tried - and I ordered what I considered cheap boxers to overly expensive boxers. Your brand is top notch and I will be ordering more. Thank you

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  • JOHN P. J.
    Verified Buyer
    Rated 5 out of 5 stars
    THE BEST!

    Hands down the best undies I’ve ever had. We all have issues down there, and these solved every one of mine. I will not wear anything else. Lifetime customer.

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