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Krakatoa Underwear

Pinatubo Briefs

Pinatubo Briefs

Rated 4.9 out of 5 stars
226 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 226 reviews
Total 5 star reviews: 208 Total 4 star reviews: 10 Total 3 star reviews: 6 Total 2 star reviews: 2 Total 1 star reviews: 0
93%would recommend this product
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226 reviews
  • Joshua B.
    Verified Buyer
    Rated 5 out of 5 stars
    The best draws ever!!!

    The most comfortable I have ever worn. I made the transition from trunks. So happy I picked these.

  • Will W.
    Verified Buyer
    2 days ago
    Rated 5 out of 5 stars
    The best

    Everything stays where it is supposed to be

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

    I’ve tried lots of different brands and this is at the top!

  • Alfonso “Alfie” P.
    Verified Buyer
    2 days ago
    Rated 5 out of 5 stars
    My new fave undies!

    Everything Krakatoa claims about their product is true! Love the way they feel and look!! Thank you!!!

  • Endowed S.
    Verified Buyer
    3 days ago
    Rated 5 out of 5 stars
    Total Comfort with Adequate Room

    Very light weight and the fit is perfect. Spacious enough for the More than Normal Male.

  • BILL C.
    Verified Buyer
    3 days ago
    Rated 5 out of 5 stars


  • David W.
    Verified Buyer
    3 days ago
    Rated 5 out of 5 stars
    Most comfortable

    I haven’t worn anything as comfortable as the pinatubo briefs. This is my 3rd order, I have eliminated all other types of underwear. Simply the best and most comfortable!

  • Jeff B.
    Verified Buyer
    3 days ago
    Rated 5 out of 5 stars
    Exactly what my husband is looking for

    My husband likes briefs with a horizontal fly, but most times he can only find what he calls old man underwear. These are quality made low rise style with a comfortable pouch for da boyz, and feel & look sexy on him. I surprised him with them and he loves them!

  • Mike C.
    Verified Buyer
    4 days ago
    Rated 5 out of 5 stars
    Best briefs

    With less fabric than other briefs they fit and feel amazing. There is no adjusting to get your parts in the pocket, they just go there! Amazing design. Thanks Krakatoa.

  • Shelby T.
    Verified Buyer
    6 days ago
    Rated 5 out of 5 stars
    The Underwear I've Always Wanted

    I've wasted a lot of money trying to find what Karakatoa offers. The fit is perfect. They got the pouch almost perfect and better than any other company. The fabric is crazy soft. Full rear coverage. Ordered one pair to try, then ordered four more. They work for me.

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