The ALPHX trunk gives you all the support of briefs plus additional leg coverage. We engineered a double-lined, contoured pouch that's deep where you need it and streamlined where you don't for maximum comfort and support. And, our simple turn-back leg stays put with no awkward visible binding line under your trousers.
For those of you who find wearing trunks uncomfortable, we got you. Our exclusive modern and athletic cuts eliminate painful pinching and annoying ride-up by allowing you to combine your preferred leg fit and waist size.
Underwear is your first layer, so comfort is non-negotiable. We start with materials that are soft to the touch: lightweight, breathable natural cotton, and modal made from beech tree bark pulp. (It doesn't sound soft, but believe us when we say it is.) Next, we add just the right amount of elastane for strength, stretch, and recovery. Finally, our waistband is obnoxious-free. It's dyed to match the underwear creating a slimmer appearance, and is subtly embossed with our signature ALPHX logo.
Bonus fact: Trunks also make your legs look longer, meaning you appear taller. I mean, come on!
Comfortable, Slimming, Attractive, Subtle: Alphx Trunks.
Our MDRN Fit sits on your hipbone, just below your natural waist, and has a slimmer contemporary leg fit. With 6% elastane for ease of movement and our stay-put leg construction, the ALPHX MDRN Fit stretches with you as you move without stretching out or riding up. Our MDRN Fit is perfect for guys who wear regular to slim/skinny-fit jeans.
Available in sizes XS-XXL
Looking for more leg room? We added one additional inch in leg circumference to the MDRN Fit to create our ATHLTC Fit, making it an excellent option for guys with thicker thighs or large/muscular legs.
In addition, our ATHLTC Fit is perfect for guys who wear athletic-fit jeans or prefer a looser leg fit in their underwear. Oh, and unlike the airlines, we don't charge more for additional leg room.
Available in sizes S-XL.
Medium waist and muscular thighs? Choose Medium ATHLTC. Large waist and average to thinner legs? Choose a Large MDRN. Try our easy-to-use Fit Finder to help you determine which combination is right for you. As we get to know you better, we will expand our size offering.
How your underwear fits is often subjective. Therefore, we encourage you to use our customized fit finder to help you find the fit that's right for you.
By the way, FREE SHIPPING IN THE USA! We like free. Competitive rates internationally.
- James is 6' and is wearing a medium MDRN FIT trunk in midnight black.
- Raphael is 6'1" and is wearing a medium MDRN FIT trunk in frost white.
- Eric is 6'5" and is wearing XXL MDRN Fit trunk in moss green and maritime navy.
- Denis is 5'10" and is wearing a large MDRN FIT trunk in glacier blue.
Our Underwear is understated, but never basic. ALPHX is designed for everyday comfort and we think, stylish enough for special occasions too. You be the judge.
Try a pair risk free with our Be Assured Guarantee.
We start with materials that are soft to the touch: lightweight, breathable natural cotton, and modal made from beech tree bark pulp. (Doesn't sound soft, but believe us when we say it is.) Then, we combine these two materials with just the right amount of elastane for strength, stretch, and recovery. Finally, our waistband is obnoxious-free. It's died to match the underwear and subtly embossed with our signature ALPHX logo.
Content: •56% Cotton, 38% Modal, 6% Elastane
•Lightweight, breathable cotton.
•4-way stretch for movement and recovery
•Double-lined contoured pouch for comfortable support
•Back rise slightly higher than front to prevent ride-up
•1.5" soft contoured waistband follows your natural curve to prevent pinch and roll down
•Smooth turn-back leg for invisible leg line under trousers: Trunk and Boxer Brief only.
•3" saddle for additional comfort and room: Trunk and Boxer Brief only.
•Tear-away labels for tag-free comfort
•Locker loop for convenience
•Ethically made in Sri Lanka
•Machine wash cold with similar colors
•Do not bleach
•Tumble dry low
•Do not iron
•Do not dry clean
•Do not use fabric softener
All men are created equal but our thighs aren’t.
So we're blowing up the industry size standards with ALPHX's exclusive leg width options. A first! Tired of your underwear riding up or pinching throughout the day? We hear you. Slimmer waist, bigger thighs? Bigger waist, smaller thighs? We got you.
Choose your own unique combination of waist and thigh size and truly change your underwear game.
Our MDRN Fit sits just below your natural waist and has a slimmer contemporary leg fit. With 6% elastane for ease of movement, our MDRN Fit is perfect for guys who wear regular to slim-fit jeans. We added an additional half-inch to the diameter of our MDRN Fit to create our ATHLTC Fit.
It's great for guys who prefer athletic cut jeans with more room in the thigh or men who like their regular jeans a little looser in the leg. Available in our Trunk and Boxer Brief styles in sizes S to XL.
Check out our size guide for actual measurements, or take our brief customized Size Finder to find your perfect fit.
Tom and Garrett
We don’t think Shipping Costs should come between us. That’s why we offer free shipping on every purchase. Restrictions Apply
Free shipping on every order within the U.S.Free shipping on all returns within the U.S. subject to our return policy. Flat Rate International shipping to select countries. Competitive International shipping rates to others.
International orders will be processed with 48 hours of receiving your order. Delivery options and prices will be displayed at checkout. Customer is responsible for any taxes and duties.
Returns & Exchanges
Alphx underwear in their original, unworn, and unwashed condition may be returned for a refund up to 30 days after the original purchase date. We'll even cover the shipping cost.
The quality of the fabric and the detail of the construction is evident, both of which contribute to a smooth and comfortable feel. The sizing explanation could be a little more helpful in terms of detailing the difference between modern and athletic. There is significant difficulty in this area due to the variations in body types. All-an-all, the product is outstanding.
Just received mine today! They’re incredibly comfy and fit well. I used the find my size button and it gave the perfect option, for me. Definitely ordering again soon.
Love them. Wore them on my wedding day!
Fit and feel great. Thank you Alphx.
The two sizes for legs is genius. I’m a 32” waist and used to buy 34” to fit legs. No more.