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Krakatoa Underwear

Pinatubo Briefs

Pinatubo Briefs

Rated 4.9 out of 5 stars
260 Reviews
Regular price $ 26.00 USD
Regular price $ 22.00 USD Sale price $ 26.00 USD
Sale Sold out
Size Guide

Save 10% when you buy 3+

Save 20% when you buy 7+

95% MicroModal, Stay Flat Waistband, Deep Pouch

📦 Orders ship within 1-2 business days

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The Pinatubo Brief with a horizontal fly, with an extra roomy pouch, is the Brief you were looking for.

An extra-deep front pouch with a super slick horizontal fly, that was engineered for easy access and excellent comfort, will keep you supported without fuss.

Form-fitting ultra-premium MicroModal fabric holds you softly and leaves you feeling fresh all day.

Wide and ultra-smooth waistband won't flip or mark your skin.

40% less material between the legs.

52 Wash Guarantee. Because we can.

Find your size

You'll need a a pair of your existing underwear, a flat surface, and a measuring tape.


The Pinatubo Briefs with a fly are perfect for active guys that prefer as little material between their legs as possible, and need easy access to the goods.
A supportive extra-large front pouch with 40% less material between the legs make for some of the best fitting Briefs on the market.

Need a little more leg coverage? Check our our Boxer Briefs with with 7" inseam, and our Trunks which have a 2" & 1.5" inseams for more choice. Whether you're working out or going for a night out, these Briefs are so comfortable you'll forget you're wearing them.


  • 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 then blend the MicroModal with 5% Spandex to allow for it to move with you.
  • Enjoy more room with a large front pouch that provides space and support for your cargo, with complete separation from your thighs. No need to adjust anymore.
  • Feel comfortable all day with a waistband that doesn't flip or fold.
  • And keep them longer with the peace of mind of our 52 Wash Guarantee.


The Pinatubo Briefs with a fly are specifically designed for maximum comfort and accessibility. They work well for a variety of activities, from working out to lounging around, they can take on anything you throw at them. Once you make the decision to embrace this everyday luxury for your privates, getting dressed in the morning will never be the same again.

Great for: Walking, Hiking, Lifting, Exercising, Yoga, Lounging.


What should I know about the fit?

The Anti-Gravity Brief does not have an inseam and the fabric between the legs is 40% narrower for an all day comfortable feel that won't bunch up. The pouch is designed to be large enough to provide you room, while being double layered to also provide support and privacy for your privates. All of this is benefited by our use of MicroModal which is incredibly lightweight and breathable.

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.

Our pouch is 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?

Our number one goal is that you're happy with your purchase.

If something doesn't fit right on your regular priced Krakatoa, let us know and we will make it right.

Try on a pair and make sure it's perfect in you. If it doesn't work for you, your first regular priced pair is covered.

After this first pair, all underwear must be unworn, unwashed, in the original condition and packaging that you received them for a refund.
If you bought multiple pairs, make sure you try ONLY ONE PAIR for fitting before you decide to use the rest.


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've built a tough product with reinforced stitching that lays flat and the very best materials we could get our hands on.

That said, you should follow the care instructions.

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 before 52 washes or 12 months, we'll replace them for free.


    Your skin never felt a fabric so soft and welcoming before. Three times softer than cotton, our high-grade, environmentally-conscious MicroModal fabric will make you rethink cotton and synthetics forever.


    Large, round, and deep support, without uncomfortable lift. Naturally odor resistant, it separates and cradles you, so you won't need to adjust anymore. Its double-panel construction keeps your privates more private.


    Smooth and soft to the touch, the unflippable waistband won't mark your skin and keep you comfortable all day. To complement the art outside the waistband, its interior has positive affirmations to get you going at every break.

Rated 4.9 out of 5 stars
Based on 260 reviews
Total 5 star reviews: 239 Total 4 star reviews: 12 Total 3 star reviews: 7 Total 2 star reviews: 2 Total 1 star reviews: 0
93%would recommend this product
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260 reviews
  • Dennis U.
    Verified Buyer
    14 hours ago
    Rated 5 out of 5 stars
    New Undies

    I love them. The feel and fit is great

  • James F.
    Verified Buyer
    Rated 5 out of 5 stars
    Most comfortable!

    Most comfortable underwear I have ever worn. Will definitely purchase more!

  • Clark B.
    Verified Buyer
    4 days ago
    Rated 5 out of 5 stars
    These are the most comfortable briefs

    I'm really impressed with these briefs. The quality is awesome and the material is incredibly comfortable. The wristband stays in place unlike other briefs that I have and the pouch gives me plenty of room without making me feel like I'm being crushed. If you looking for comfort in your briefs these are the ones you need. I'll be buying more.

    Verified Reviewer
    5 days ago
    Rated 5 out of 5 stars

    Very form fitting! Almost as if they were tailored to me specifically! I love the front pouch, so roomy but also so smartly designed and definitely makes the bulge look great. My favorite part about these briefs is the way they grip and secure the back of your nuts and taint, I’ve never worn anything quite this form fitting before, but it really feels like a second , more supportive skin down there I cannot wait to buy them all!

  • John M.
    Verified Buyer
    5 days ago
    Rated 5 out of 5 stars
    Over Time

    My first Krakatoa briefs were few years back and the ones that arrived a few days back are the best so far,

  • James L.
    Verified Buyer
    5 days ago
    Rated 5 out of 5 stars

    I purchased a pair of briefs years ago and like them but the waist band is so secure that when it’s time to go. The waist band is up high and strong enough to impede getting ready. So I finally ordered these briefs with the horizontal fly. It works great and makes it so much easier to go. That one feature made it for me. They do fit rather tight and I followed the size recommendations soI might try one size larger.

  • Bryan W.
    Verified Buyer
    1 week ago
    Rated 5 out of 5 stars
    Excellent drawers

    Most comfortable I’ve ever had like wearing nothing at all.More than satisfied!!!

  • Phil C.
    Verified Buyer
    1 week ago
    Rated 5 out of 5 stars
    Great underwear!

    Love the softness & the fit. Going online to buy some more right after this review..

  • Harold N.
    Verified Buyer
    1 week ago
    Rated 5 out of 5 stars

    Fit perfectly and feel great.

  • William J B.
    Verified Buyer
    1 week ago
    Rated 5 out of 5 stars

    Only place my boys are happier is the nudist camp. Great product!

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