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Anti-Gravity Trunks

  • $34.00
2" inseam, 95% MicroModal, Stay Flat Waistband
Free shipping in the US on orders over $75

About our trunks

Hey Alex, I Have Questions!

The Anti-Gravity Trunk is designed with a 2" inseam. The legs are designed to stay put, but can ride up a little depending on activities. 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.

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.

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.

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 accomodate 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.

We try our best to ship items the same day we receive your order. Shipping times can vary depending on your location. Inside the US you can expect to see your package between 3-5 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.

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

If something doesn't fit right, 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 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 a pack with multiple pairs, make sure you try ONLY one pair before you decide to use the rest.

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.

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.

Customer Reviews
5.0 Based on 68 Reviews
5 ★
4 ★
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2 ★
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Customer Photos
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Filter Reviews:
Carl S.
United States United States
I recommend this product

Best. Underwear. Ever.

These underwear are amazing. From the minute you step into them, everything falls into place. And everything stays in place. All day. No adjustments necessary. No pinching. No creeping. No smushing. Just comfortable, happy, well supported goods all freakin day.

Krakatoa Underwear Anti-Gravity Trunks Review
Josh O.
United States United States
I recommend this product

Comfy ,but rides up

The underwear are soft and comfortable definitely hold a package in place with some buldge, but they ride up I wish I would’ve gone with the longer ones.

Krakatoa Underwear Anti-Gravity Trunks Review
Mario S.
United States United States

Love the fit

Love the fit and the pouch for the boys. Size Small fits perfect as M runs ba bit big. Thank you Karakatoa!

Krakatoa Underwear Anti-Gravity Trunks Review
Andrew G.
United States United States
I recommend this product

Fits great

Feels and fits great.

Mike H.
United States United States
I recommend this product

Only drawers in my drawer drawer

Best underwear I’ve ever found. Absolute comfort with the support, yet room, I need. 12/10

Brian F.
United States United States
I recommend this product

New to brand

I do like the pair very much. Only issue is I am a 35/36" waist and probably should have gone a size higher, but they do feel like you're not wearing anything.

Thomas B.
United States United States
I recommend this product

Fantastic Fit. Very comfortable

Great purchase. The legs do not ride up. material very soon. Just enough room in the pouch so my guys are not uncomfortable. I will buy more. I wish they came in white.

Mike C.
United States United States
I recommend this product


Very soft and comfortable support pouch is excellent fit and no roll waistband is great

Michael P.
United States United States

Very Comfortable

Loved it, glad I ordered the promo pack as well as an additional trunk

Todd C.
United States United States
I recommend this product

Really comfortable

Really like the feel and fit. I plan on ordering more.

David C.
United States United States
I recommend this product

Super smooth, comfy, and with a proper pouch!

I was a fan of CK Body Hip Briefs for years - and was devastated when they discontinued them! No brief had as good of a pouch, until I discovered Krakatoa. After waffling a while on getting some, I finally broke down and am not disappointed. They are great for daily wear at home or work, and give great support in my heavy lifting and cardio workouts. The "squished" feeling most briefs give is not here, they come with a roomy pouch and that's appreciated!

Joe S.
United States United States
I recommend this product

Excellent comfortable trunks

I’ve had the anti-gravity and the Vesuvius trunks and they are very nice and comfortable. The material is nice and light and breathes well. The material is very soft and smooth, almost a slick feeling like a nylon or poly, but this softens with washes, but so far do not notice much, if any pilling, which some other brands of modal seem to do. They are pretty similar to CK modal but with a slightly more roomy pouch. The pouch design is one of the better ones out there. It’s supportive but not restrictive. Also, the sizing guide seems spot on. Fit is excellent on all the shorts I’ve received. I can wear them all day and night comfortably and they look great too for no pants days at home. Great trunks overall. I’m not throwing out all my other brands, but these are definitely in the rotation. Great product from a small business.

Mike d.
United States United States
I recommend this product

Most comfortable underwear

I work outdoors so comfortable underwear are very important. Ive purchased multiple high end underwear and these by far are the best value and comfort.

Jeffrey D.
United States United States
I recommend this product

Hammock Heaven

Honestly surprised by how much I like these. Calvin Klein needs to get with the program and learn a thing or two from Krakatoa.

Nathan W.
United States United States
I recommend this product

Light Weight and Never Slips

These are so comfortable. The pouch gives just the right support without smashing everything. The waistband is wide and fits just right, so no slipping. I appreciated the offer of the giftKard toward another pair. Just ordered them today. I wish there were more color or pattern options? I’ll be replacing my old underwear with these!

United States United States
I recommend this product


I “like” these, and when you put a fly in them, I will order more and LOVE them

Mike O.
United States United States
I recommend this product

They claw up my leg. Hopefully boxer brief will not.

Peter M.
United States United States
I recommend this product

Krakatoa is the best!

I have tried Krakatoa for the first time and they are GREAT! Super light material, very breathable, and great support for the boys!

Lars P. Köster
Germany Germany
I recommend this product


My package likes it.

Terry Y.
United States United States
I recommend this product

Amazing fabrics

The fit is great, the pouch is ample. I’ve worn them 5-6 days with no binding, tightness—they really stretch.