Mack Weldon Underwear: What You Need to Know (Guide)

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Author’s Note: I purchased all of my Mack Weldon underwear with my own money, except for the Stealth boxer briefs, which Mack Weldon sent me for free to review. I was not compensated in any other way except for affiliate marketing if you purchase.


Table of Contents


Wanting to bridge the “fusion between old-school quality and modern-day technology,” Mack Weldon started as a premium men’s underwear company in 2011. Since then, Mack Weldon has expanded into other parts of men’s fashion, including shirts, pants, jackets, accessories, and workout gear. Yet I am most interested in Mack Weldon underwear, and as an avid fan, I wrote this Ultimate Guide to help you choose your ideal Mack Weldon underwear.

Mack Weldon sells a complete assortment of men’s underwear, including the main four styles of briefs, trunks, boxer briefs, and boxer shorts. Mack Weldon also has several collections for different activities, from everyday wear to athletic and water-tolerant underwear. Yet, Mack Weldon doesn’t produce less-common underwear styles such as jockstraps, bikini briefs, or thongs. You also won’t find novelty designs like Shinesty’s X-Rated Collection.

What you will find is high-quality men’s underwear with timeless designs. Mack Weldon offers four collections of men’s underwear, so use my guide to determine which collection(s) work best for you. 

My Mack Weldon Underwear Collection

My Review of Mack Weldon Underwear

I own eight pairs of Mack Weldon underwear: two Silver trunks, two AIRKNITx trunks, one AIRKNITx brief, two Stealth boxer briefs, and one 18-hour Jersey trunk. My husband owns another five Stealth boxer briefs (they are his favorite underwear). My favorites are my three AIRKNITx pairs, not so much the Silver and 18-hour Jersey trunks. To me, this makes complete sense. I strongly prefer modal, bamboo, or polyester/nylon fabrics, which AIRKNITx provides. I don’t mix well with cotton, which is the basis of my Silver and 18-hour Jersey trunks. The Stealth boxer briefs are meant for getting into the water, as they are more of specialty underwear. My experience is why knowing which fabrics you like and don’t like is so important!

The AIRKNITx pairs look amazing, as I love the colors, especially the contrast stitching on my white trunks and blue briefs. The material is so soft, and it feels so comfortable while wearing. The 17% Elastane content is key here as elastane (Spandex) allows the fabric to stretch. Many pairs of men’s underwear are 5% or less elastane content, so you can imagine how nice 17% feels. Yet, I don’t find my AIRKNITx pairs riding up as they stay in place nicely.

Me wearing my AIRKNITx briefs.

The best part of my Silver trunks is the pattern, as I like both designs, the blue one a bit more. However, as my Silver trunks are cotton-based – not modal-based like the Silver HD trunks – I am not as comfortable in them as the AIRKNITx pairs. The same goes for the 18-Hour Jersey trunks I own.

On the other hand, one aspect I prefer of the Silver trunks over the AIRKNITx pairs is the waistband size. The standard men’s underwear waistband is around 1.5”. I like thinner waistbands, so I appreciate that the Silver trunks have a 1.5” waistband instead of 1.75” on the 18-Hour Jersey and AIRKNITx collection. Although, the AIRKNITx waistbands feel a bit softer than the Silver and 18-Hour Jersey waistbands. I don’t know if this is by design or if it just so happened that the batch I have uses a slightly different fabric content.

AIRKNITx waistband (left) vs. Silver waistband (right)

I purchased my first pair in 2019 to try out, followed by five pairs in 2020, and the two Stealth boxer briefs in 2023, so I am pretty happy with all of my Mack Weldon underwear. All eight have held up very well. I feel sophisticated while wearing them, as underwear does influence your self-confidence like any other article of clothing!



The Details of Mack Weldon Underwear

I’ll use my nine criteria below to analyze Mack Weldon underwear and provide tips.

Material and Fabric

I want to start this guide by discussing material and fabric because Mack Weldon specifically organizes their underwear by the fabric. Mack Weldon has seven different fabric collections, although only five of them pertain to underwear:

  • AIRKNITx: My favorite Mack Weldon underwear, AIRKNITx is made from 50% polyamide, 33% polyester, and 17% elastane (Spandex). It feels like a mesh blend and is highly comfortable. I love that AIRKNITx contains 17% elastane, which is relatively high for men’s underwear (20-22% Spandex is as high as you’ll get, and most men’s underwear is in the 5-8% range). AIRKNITx is best for workouts and high-sweat activities, yet I love wearing them all of the time!
    • AIRKNITx HD: Mack Weldon also features the HD version of AIRKNITX, which is 86% polyamide and 14% elastane. Polyamide is supposedly a better version of polyester, hence the “HD” part. I own one pair of AIRKNITx HD, and I personally don’t feel any difference between the two versions fabric-wise. But one thing I like about AIRKNITx HD is that some patterns include a different color for stitching, which I love.
    • Several guys have told me that they order one size up for AIRKNITx briefs, as they are tighter than other underwear. But for all other AIRKNITx underwear, you should order true-to-size.
Best Value for Everyday Wear

AIRKNITx Underwear Collection

✅ I love AIRKNITx underwear and I believe it is the best value for Mack Weldon.
✅ 50% Polyamide/33% Polyester/17% Spandex blend – very smooth
✅ Available in briefs, trunks, boxer briefs, 8″ boxer briefs, and boxer shorts!
💵 Ranges $30-38/pair
❌ No fly


  • 18-Hour Jersey Collection: Made of 47.5% cotton, 47.5% modal, and 5% Spandex, the 18-Hour Jersey Collection is Mack Weldon’s original underwear collection. The “18-Hour” name refers to the 18 hours Mack Weldon lets the fabric rest before sewing. Mack Weldon claims the 18-hour rest period creates a fabric that “won’t twist or bunch.” I have a pair of 18-hour Jersey trunks, which I’ll comment on toward the end of this guide. This collection is best for lounging or everyday underwear and is also Mack Weldon’s cheapest underwear.
Everyday Soft Alternative with a Fly

18-Hour Jersey Underwear Collection

✅ Lowest cost Mack Weldon underwear collection for everyday wear
✅ Vertical Fly
✅ Available in briefs, trunks, boxer briefs, and boxer shorts
💵 Ranges $26-34/pair
⚠️ 47.5% Cotton/47.5% Modal/5% Spandex blend – softer than 100% cotton!


  • Stealth Collection: A combination of 37% Q-NOVA Recycled Nylon, 25% Q-NOVA non-recycled Nylon, 28% polyester, and 10% Spandex, Mack Weldon’s Stealth Collection is geared toward water activities as it is both seawater and chlorine-safe. Yet, of course, guys may wear Stealth boxer briefs outside of the water too – read my full review of Stealth boxer briefs here. As the newest collection, Stealth has the fewest length and color options.
    • My husband ordered five Stealth underwear in January 2024 and had to exchange them for one size larger than what the size chart specified. My previous Stealth boxer briefs were slightly too big for me, so you may want to check right away for sizing discrepancies if you order Stealth boxer briefs.
Ideal for Beach and Water Activities

Stealth Boxer Briefs

✅ Designed for the water and is “seawater and chlorine-safe”
✅ Nylon/Polyester/Spandex blend
✅ Available in both 6″ and 8″ boxer briefs for leg skin protection
✅ Cool Stealth pattern on each side!
❌ No Fly
💵 Ranges $38-42/pair
➡️ Read my full review here


  • Silver Collection: Made from 84% Supima Cotton, 10% Ionic+ (silver-infused) polyester, and 6% Lycra (Spandex). Silver has antimicrobial properties, so it helps control odor and general freshness. Thus, Mack Weldon’s Silver collection is best for very high-sweat situations, hikes, and long trips when you wear the same underwear for extended periods. I have Silver trunks, which I also comment on at the end of this guide.
    • Silver HD: 66% Micro Modal, 21% Nylon, 7% Ionic+ Nylon, 6% Spandex. I own the Mack Weldon Silver trunks from the regular cotton-based Silver Collection, and as I prefer modal to cotton, I recommend splurging for the Silver HD collection.
    • Mack Weldon now offers an option to include built-in silver briefs in its Stratus shorts line-up. If you haven’t worn shorts with a built-in underwear liner, check out my guide to Shorts with Built-in Underwear.
  • 24/7 Woven: 24/7 Woven only applies to men’s boxer shorts and uses a fabric blend of 81% cotton, 17% Coolmax Polyester, and 2% Spandex. Mack Weldon designed these boxers to be thin for cooling, so they don’t bulk up under pants. However, if you love boxers, I would stick with the 18-Hour Jersey boxers or the new AIRKNITx boxer shorts.

Buy Now: Simple, yet sophisticated 24/7 woven boxers.


I also want to point out that all Mack Weldon underwear has a “cool zone,” according to Mack Weldon, above the butt. In practice, I didn’t find any difference in terms of sweating. Nonetheless, it is visible on most pairs, and this area has slightly different fabric variations. However, it is always very similar to the fabric of the rest of the underwear.

Showing the Cool Zones of Mack Weldon underwear
Showing Mack Weldon’s “Cool Zones” on AIRKNITx (left) and Silver Trunks (right)

Colors and Patterns of Mack Weldon Underwear

I love Mack Weldon because they provide many colors and patterns, thus no need to buy boring underwear. Unlike other companies, none of Mack Weldon’s patterns are comical or too bold, but rather sport a timeless design.

  • 18-Hour Jersey Collection: You’ll find a great selection of colors and patterns here because it is Mack Weldon’s original collection and the “everyday” product. For example, the 18-Hour Jersey boxer briefs sport nine patterns and ten colors – what a selection!

Buy Now: An example of everyday 18-Hour Jersey boxer briefs in a striking red palette.


  • AIRKNITx: AIRKNITx features the largest selection of colors and patterns than any other Mack Weldon collection. I prefer the AIRKNITx color and pattern selection over any other Mack Weldon collection because of offset color stitching and bolder color patterns. Yet look at both AIRKNITx’s designs and those of the 18-Hour Jersey Collection – both collections feature timeless solid colors and awesome patterns.

Buy Now: Charcoal with orange contrast stitching.


  • Silver Collection: While the Silver Collection features a few different colors and patterns, I find them primarily subdued – dare I say boring – compared to the other collections. Interestingly, I find the Silver HD sub-collection to have a better selection of colors. 
Mack Weldon Silver Briefs in True Navy.

Buy Now: Sophisticated Mack Weldon Silver Briefs in True Navy.


  • Stealth Collection: The Stealth collection has the fewest colors; however, none are solid colors. All Stealth Collection boxer briefs have a unique “stealth” pattern printed on them, as an homage to the Stealth Bomber that was the name’s genesis. I find the design pretty cool!

Mack Weldon Stealth boxer briefs in red.

Buy Now: Mack Weldon’s Stealth pattern on its red 8-inch boxer briefs.


  • 24/7 Woven Boxers: There are many patterns for 24/7 woven boxers. However, most are some type of checkered or plaid pattern—traditional for men’s boxer shorts.
Mack Weldon Stealth boxer briefs in red.

The 24/7 boxers in Spicy Glen Plaid – perhaps my favorite pattern!

Length

As noted above, Mack Weldon produces a very “mainstream” assortment of men’s underwear, so there won’t be any radical designs. Yet only boxer briefs – with very standard 5” or 6” inseams – form a part of all four men’s underwear collections. Depending on the collection, briefs, trunks, long-leg boxer briefs, and boxer shorts are all case-by-case.

  • 18-Hour Jersey Collection: Briefs, 3” trunks, 6” boxer briefs, and boxer shorts. A very standard underwear collection.
  • AIRKNITx: Briefs, 3” trunks, 5” boxer briefs, 8” long-leg boxer briefs, and as of April 2024 – boxer shorts!
  • Silver Collection: 3.75” trunks and 6” boxer briefs
  • Stealth Collection: 6” boxer briefs and 8” long-leg boxer briefs
  • 24/7 Woven boxers: 4″ boxer shorts
A length comparison of men’s trunks and boxer briefs. Mack Weldon sells 3″ trunks and 6″ and 8″ boxer briefs, depending on your preferences. (The 3″ image on the left is me wearing Mack Weldon’s trunks.)

Prices of Mack Weldon Underwear

Mack Weldon is a premium brand and charges premium prices. Their closest competitors are Tommy John, Tani USA, Saxx Underwear in terms of style, quality, and pricing. I recommend AIRKNITx and the Stealth collection, as these two collections provide the biggest bang for your buck at Mack Weldon. Prices below are as of April 2024 and may have changed.

  • 18-Hour Jersey Collection: $26 – $34 per pair
  • AIRKNITx: $30 – $38 per pair
  • Silver Collection: $36 – $44 per pair
  • Stealth Collection: $38 – $42 per pair
  • 24/7 Woven Boxers: $34 per pair

Mack Weldon sometimes has sales, although not as often as other companies. If you like Mack Weldon and want to stock up, then you can save money by buying in bulk through their Pack Builder. You can usually save between 7-12% by buying three, five, or seven pairs at one time.

Also, if you are in the US military, a First Responder, a teacher, a student, or a nurse/doctor/medical staff, you may be eligible for 15% off your order with Mack Weldon!

Flys

Besides no-fly and the standard vertical fly, Mack Weldon offers a two-way or dual-sided vertical fly on its Silver HD collection. I find that cool because until I saw this, I never thought about how men’s underwear designers force left-handed guys to conform to the right-handed majority regarding underwear flys. 

  • 18-Hour Jersey Collection: Standard vertical fly, except for boxer shorts containing a button fly.
  • AIRKNITx: No fly
  • Silver Collection: Standard vertical fly, except for the Silver HD sub-collection, which features the dual-sided or two-way vertical fly.
  • Stealth Collection: No fly
  • 24/7 Woven Boxers: Vertical button fly (so there aren’t any slips)

Pouches

Mack Weldon offers a standard non-separated pouch on all underwear (except boxer shorts). It works for me! Mack Weldon notes that its Stealth collection includes the “Flyless MotionCNTRL Pouch,” yet they don’t give any details about it. Nonetheless, if you are looking for a separated pouch, you’ll need to look elsewhere and read my guide all about pouches.

Interior view of Stealth’s Flyless MotionCTRL Pouch

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Waistbands

Mack Weldon has very conservatively-designed waistbands. Most of its waistbands are gray with a simple blue stripe at the top. The waistband continues the underwear pattern on some of its underwear, camouflaging the waistband entirely. A signature piece of Mack Weldon’s waistbands is the “For Daily Wear” marking on the interior of the waistband. If you wear Mack Weldon’s underwear inside-out – which you can per their website – then the “For Daily Wear” will appear outside.

Mack Weldon Underwear “For Daily Wear” imprint

And speaking of which, why would you wear their underwear inside out? Mack Weldon puts the label on the outside of its underwear, and some guys may find this weird (I did at first!). Mack Weldon’s FAQ states that the printed lettering may become “scratchy.” Thus, it is best to keep the lettering on the outside, away from the skin, for comfort. With the Mack Weldon underwear I have now, a couple of pairs have lettering come off as you use it and will eventually disappear. Yet since the lettering is on the outside and on the back of the leg, it doesn’t affect comfort or style. Either way, I prefer tagless underwear, so I understand why Mack Weldon designed it this way.

Label coming off (left) vs Label staying intact (right)
What the tag looks like when wearing Mack Weldon

Multipacks

Mack Weldon offers a three-pack of AIRKNITx and 18-Hour Jersey underwear on its pages. Do not go for these. Go to “Shop in the top menu bar, and under “Underwear,” click “Pack Builder.” Not only can you select three, six, and nine-packs, but you’ll be able to customize colors! This is a big benefit since the “standard three-packs” only come with a preset range of colors. Furthermore, by going with six and nine-packs, you can save up to $40-$50 depending on the style you choose.

Design Country

Mack Weldon designs its underwear at its headquarters in New York City. According to its website, Mack Weldon manufactures its underwear outside of the United States, including factories in Thailand, Peru, China, Egypt, and Vietnam. Furthermore, Mack Weldon notes its factories are WRAP-certified, “an independent, objective, non-profit team of global social compliance experts dedicated to promoting safe, lawful, humane, and ethical manufacturing around the world through certification and education.”

Where to Buy Mack Weldon?

Mack Weldon is primarily only available online through its website, mackweldon.com. Unlike other men’s underwear brands, Mack Weldon is not available through Amazon. In fact, Mack Weldon is not widely available, except at high-end stores like Dillards, Nordstrom, and Saks Fifth Avenue.

Mack Weldon has six retail stores in the United States: Austin, Boston, Chicago, Los Angeles, and two in New York. You can find their locations on their website, where you can buy Mack Weldon in person.

Are Mack Weldon Underwear Worth It?

Yes, I love my Mack Weldon underwear. It is high-quality underwear for various uses and situations. Nonetheless, as Mack Weldon is quite expensive compared to other brands, I recommend the following to maximize your money:

  • For almost all situations, you can’t go wrong with AIRKNITx. Mack Weldon provides a plethora of colors and patterns with its AIRKNITx lineup, perhaps some of the boldest across the entire Mack Weldon underwear lineup. AIRKNITx offers all styles (except boxer shorts), including briefs and 8” long-leg boxer briefs. And since the price of AIRKNITx is just a tad higher than the cheaper 18-hour Jersey lineup and far more affordable than the Silver and Stealth collections, I believe AIRKNITx is the best buy from Mack Weldon.
  • Go with the Stealth lineup if you wear underwear under boardshorts at the beach or swimming. Stealth is pretty pricey; however, they are seawater and chlorine-safe. Check my blog post regarding wearing underwear under boardshorts for more options and how to choose.
  • For lovers of boxer shorts, you can choose the new AIRKNITx boxers or the 18-hour Jersey or 24/7 Woven boxer shorts. I have not worn either kind personally, so I can’t comment on their real-world use. However, I love AIRKNITx underwear, and I would choose those boxers, followed by the 18-hour Jersey boxers.

    Mack Weldon is an excellent and popular choice if you want a high-quality brand to add to your underwear collection. I’d love to hear your feedback on Mack Weldon underwear in the comments below!

    Mack Weldon Underwear Frequently Asked Questions (FAQs)

    Here are some frequently asked questions about Mack Weldon Underwear:

    Where is Mack Weldon from?

    Mack Weldon is an American company based in New York City, but it ships orders to both the United States and Canada. Mack Weldon has four store locations in the U.S.: Boston, Chicago, New York City, and Myrtle Beach.

    What is Mack Weldon known for?

    Mack Weldon is known for high-quality, modern menswear, including its men’s underwear. Mack Weldon underwear is very popular, and recently, Mack Weldon has expanded its offering of men’s clothing, including shirts, shorts, and pants.

    What underwear is like Mack Weldon?

    Men’s underwear brands similar to Mack Weldon include Tommy John, Saxx, Tani USA, and Calvin Klein.

    What is AIRKNITx?

    AIRKNITx is a type of men’s underwear produced by Mack Weldon. Made from a polyamide/polyester/elastane microfiber fabric blend, AIRKNITx works well as both everyday underwear and underwear for high-sweat situations, such as working out or hiking. I believe AIRKNITx is the best value of Mack Weldon’s underwear collection.

    Does Mack Weldon offer a military, healthcare, student, or teacher discount?

    Yes! Mack Weldon offers a 15% discount to U.S. military members, healthcare professionals, students, and teachers through Mack Weldon’s Community Heroes program.

    Does Mack Weldon offer a first time discount?

    There isn’t an explicit first-time discount, but there are other ways to save money at Mack Weldon. For example, by taking advantage of Mack Weldon’s Pack Builder program, you can save 7-12% off three, five, and seven-packs of underwear. Or if you qualify for the Community Heroes program noted above, you can save 15% on your order.

    Does Mack Weldon have a loyalty program?

    Yes! When you sign up for MW Rewards, Mack Weldon gives you one point per dollar spent, which you can then redeem for discounts on future orders. Furthermore, if you spend $500, you can get two points per dollar spent plus free shipping at $50 per order instead of $100. And if you spend $1000, you’ll get three points per dollar, free shipping on all orders, and early access to new products.

    Is it weird that the tag is on the exterior of Mack Weldon underwear?

    Yes, but you’ll get used to it. Mack Weldon says they put the tag on the back leg as a homage to military underwear. Practically, this is better as you won’t deal with any scratchy tags against your skin.

    Is there a money-back guarantee?

    If this is your first time purchasing Mack Weldon underwear, Mack Weldon offers a refund or exchange on one pair, which is common amongst prominent men’s underwear brands. My husband had to exchange his boxer briefs for a different size and Mack Weldon’s exchange process was super easy and hassle-free. Note that you must ask for a refund or exchange within 30 days of purchase, and it must be unworn except for the first pair.


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    Eric at MensUnderwearGuide.com

    Eric is the creator and writer of MensUnderwearGuide.com. He loves boxer briefs and trunks, exploring the new world of briefs, the soft feeling of modal and the lightness of mesh microfiber, and of course writing and researching the world of men's underwear.

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