Skip to content

ALPHX Athletic Fit Comfort Class Trunk Midnight Black

Select Color
Select Size
Select Leg Width - MDRN (Slimmer fit) or ATHLTC (Fuller fit)


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.


        MDRN FIT

        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. 

        ATHLTC FIT

        We added an additional inch to the leg circumference of the MDRN to create our ATHLTC fit. The ATHLTC is great for guys who wear athletic cut jeans with more room in the thigh or prefer their regular fit jeans, a little looser in the leg.

        Available in our Trunk and Boxer Brief styles in sizes S to XL.

        Because our briefs already have a high-cut leg opening, we only offer them in the MDRN FIT. Don't worry; we can add an ATHLTC Fit here, too, if needed.  

        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.




        Be Comfortable

        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, for strength, stretch, and recovery, we combine these two materials with just the right amount of elastane. Our tonal waistband is obnoxious free subtly embossed with our signature ALPHX logo.

        • 56% Cotton, 38% Modal, 6% Elastane
        • Ethically made in Sri Lanka
        • 94% Sustainable. 100% Comfortable
        • 155 GM 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
        • Tear-away labels for tag free comfort
        • Locker loop for convenience


        Care Instructions

        • Machine wash cold with similar colors
        • Do not bleach
        • Tumble dry low
        • Do not iron
        • Do not dry clean
        • Do not use fabric softener

          Peace of Mind, Guaranteed


          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

          Domestic orders are shipped via USPS First Class: tracking information provided.

          BE ASSURED

          Give ALPHX a risk-free try, and if we’re not for you (we think we’re a catch btw), your purchase is on us. 

          We believe we make a damn good product, but we understand that every man’s body is different, and we may not be right for everyone. That’s why we remove any risk for you to try ALPHX. If it doesn’t work for you, no hard feelings. We’d love to know why so we can continue to improve, but we will happily issue you a refund.  

          Our Be Assured guarantee is good for your first underwear purchase from If you purchased more than one pair, please try one on before removing the others from their packaging. If you don’t like the first pair, the others are still eligible for our standard return policy. 

          Be Assured guarantee is limited to one use per household and must be claimed within 30 days of the original purchase date.

          Request a Be-Assured Refund


          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. 

          Request a Return Label


          We've all done it. Not sure between two sizes so you order both and return the one you don't want. Or you order a size, discover it's not quite right and then you have to pay for the size you need, and wait for your return to be received and processed before getting your credit on the one you sent back.

          And maybe you had a code to save on your first purchase that no longer works on buying the size you need, so you pay more. Frustrating, right?

          With ALPHXchange, we won't make you wait until we receive the returned items back before sending you the items you need.

          We'll email you your return label and simultaneously ship out your replacement items at whatever price you paid for your original order. And both the return and the new items ship free.

          ALPHX underwear in their original, unworn, and unwashed condition may be exchanged for an alternate size or color up to 30 days after the original purchase date. We'll even cover the shipping cost. 

          Request an Exchange


          • International orders under $50.00 ship for the flat rate of $5.00. International orders over $50 ship FREE  via International Priority Delivery  (6-10 business days) .  The following Countries are covered by our $5.00 flat rate and Free shipping program: 
            • Åland Islands, Albania, Andorra, Armenia, Belarus, Bosnia & Herzegovina, Faroe Islands, Georgia, Gibraltar, Greenland, Guadeloupe, Guernsey, Iceland, Isle of Man, Jersey, Kosovo, Liechtenstein, Mayotte, Moldova, Monaco, Montenegro, North Macedonia, Norway, San Marino, Serbia, Svalbard & Jan Mayen, Switzerland, Turkey, Ukraine, Vatican City, Australia, Austria, Belgium, Bulgaria, Canada, China, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong SAR, Hungary, India, Ireland, Israel, Italy, Japan, Latvia, Lithuania, Luxembourg, Malta, Mexico, Netherlands, New Zealand, Philippines, Poland, Portugal, Réunion, Romania, Singapore, Slovakia, Slovenia, South Korea, Spain, Sweden, Taiwan, United Kingdom
          • Free shipping only applies to Priority International.  
          • You will receive a tracking number to follow your order throughout the process.  
          • Your international shipping includes insurance.  There have been interruptions of this service due to COVID outbreaks.  If this service is not available at the time you place your order, you will be shown alternative shipping methods/carriers and costs associated with them.  We apologize for any inconvenience and are more than happy to answer questions or suggest alternatives. 
          • International orders will be processed with 48 hours of receiving your order: M-F.
          • Delivery options and prices will be displayed at checkout.
          The customer is responsible for any taxes and duties owed.

            Our Be Assured Guarantee applies to International orders as well. We got you. 

            ALPHX underwear in their original, unworn, and unwashed condition may be returned for a refund up to 30 days after the original purchase date. Customers are responsible for all return shipping costs.  

            Timing is estimate only. Any transport delays are unfortunately beyond our control.  You will also be given options for expedited shipping at checkout.











              Bennett is 5'9" and is wearing an XS MDRN FIT Trunk

              Diego is 5'10" and is wearing a Small MDRN FIT Trunk

              Brian is 6' and is wearing a Medium MDRN FIT Trunk

              Denis is 5'10" and is wearing a Large MDRN FIT Trunk

              Amry is 5'10" and is wearing an XL MDRN FIT Maritime Navy Trunk

              David is 5'10" and is wearing an XL MDRN FIT Trunk

              Eric is 6'5" and is wearing an XXL MDRN FIT Trunk

              Nunzi is 5'10" and is wearing an ATHLTC FIT Trunk

              0 / 0
              FREE Shipping on all orders over $50Buy 3 get 20% offPay in 4 instalments available at checkoutBuy 5 get 25% off

              Choose your fit

              MDRN FIT

              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.

              ATHLTC FIT

              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. 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.

              Available in our Trunk and Boxer Brief styles in sizes S to XL.

              Athletic Fit

              Modern Fit


              SAVE 20% ON THREE SAVE 25% ON 5