Quick Dry Open Fly Functional Athletic Boxer Briefs 3 Pack

$42.99 $34.39 Save 20%
Shipping calculated at checkout.
749 reviews
Size: S
Color: Black/NavyBlue/DarkGray
  • Patented dual pouch technology designed for extraordinary support with extra space, provides an appropriately dry environment with separation to ensure the hygiene and health of your buddy.
  • Ultralight air-mesh fabric to eliminate heat and stickiness.
  • Functional fly serves as an easy answer when nature calls.
  • Light-weighted, soft, and supportive fabric allowing absolute comfort.
  • 6.5-inch boxer briefs, no riding up and rubbing thighs.


Fabric: 77% Polyamide, 23% Spandex

!! Due to the frequent upgrading of fabrics, the ratio of ingredients is for reference only. !!


Gentle cycle with cold water in machine wash/ Hand wash.

Size: S
Color: Black/NavyBlue/DarkGray

Product information

We Want You to Experience A New Level of Comfort with Separatec.

If you are unhappy for any reason, we ask that you allow us to make things right. Please email our satisfaction guarantee customer service center at service@separatec.com regarding any issues with your purchase.

Exchange/refunds for first order:

  • We will refund or replace your first pack without question within the first 30 days of purchase, shipping charges are not included.
  • For this reason, we recommend only ordering a pack for your first time trying our products to see if Separatec is right for you.
  • Beyond your first trial pack, we can only exchange any unopened items for a refund or replacement.

Exchange/refunds for other orders:

  • If you have tried a pack from your order and have decided to return the remaining unopened items for a refund, we will refund you the amount paid in full minus the cost of shipping once the unopened items have been received and inspected. Shipping rates will be determined by location.
  •  If you want to exchange the unopened items, we will reship you a new product once the unopened items have been received and inspected. Shipping rates will be determined by location.

( Reminder: If you purchased shipping insurance can enjoy a free reship. )


How to activate the Satisfaction Guarantee?

If you wish to activate the Satisfaction Guarantee, we require that you contact us before sending anything back. Please e-mail service@separatec.com with the following details:

  • Your order number
  • Email address

This information is important to help us verify that the purchase was made from separatec.com and will be used solely to verify that the request is eligible under the program.


Please be advised:

  • Satisfaction Guarantee only applies to purchases made through separatec.com within 30 days.
  • All items must be unworn, unwashed, and in original packaging.
  • All shipping costs, duties/import taxes and any other associate fees such as exchange and transaction fees, on the original purchase, including fees incurred for returns, are not refundable.
  • Special offers are non-refundable, non-exchangeable, and cannot be used with the satisfaction guarantee.


Separatec reserves the right to reject a return and decline to refund, subject to applicable law, under the following circumstances:

  • That the items received were not in their original condition/packaging.
  • That the items received were received without proper or secure transportation packaging.
  • That you returned products that you were not entitled to return.
  • That items were missing from the return.
  • That you did not follow the return instructions.


Orders canceling:

We accept order cancellations before the product is shipped. If the order is canceled you will get a full refund including shipping charges.


If you have any questions don't hesitate to get in touch with us at service@separatec.com.

Gentle cycle with cold water in machine wash/ Hand wash.

Customer Reviews

Based on 749 reviews
Never E.
Good fly & pouch, but uncomfortable crotch panel & stitching

I've purchased 3-packs of two similar Quick Dry boxer briefs, models STMNKX22020-30301M (the standard, bottom fly style, offered as a black/gray/red trio and pictured here with red stitching) and these ST511X-BLNBDG4 (the "open fly" style, offered as a black/gray/blue trio and pictured here with gray stitching). They're similar, but not identical, and each has its positive and negative aspects.

They both use the same thin, stretchy material made from approximately 80% polyamide and 20% spandex. I love this material because it's light weight, breathable, form fitting, and VERY stretchy. It doesn't sag after a full day of active use. It isn't see-through unless you back light it.

Both styles have the lower front flap that hooks over the end of your ****. This "open fly" style also has two vertical openings on either side that I find easier to use at the urinal when operating through the fly on my blue jeans. I like the horizontal fly and **** pouch design. The single layer of material with an opening on the bottom doesn't restrict the air flow, growth, or movement of my ****, which is both comfortable and fun. It does take a little practice to get just the right amount of overlap (underlap?) of the fly when I'm done at the urinal, but that's minor.

My biggest complaint about the standard fly style is that the ball pouch is barely a pouch at all, and doesn't provide nearly enough room to hold your balls without pushing them up high against your body. This open fly style has a ball pouch that's twice as roomy and could cup your balls nicely IF it extended backward farther. The problem is that this open fly style has a fabric panel that runs side-to-side along the inside of each leg and under the crotch. The stitching along the front of this flat panel defines the back of the ball pouch, and it's about an inch farther forward than it should be. The stitching cuts into my **** uncomfortably, especially when seated. The standard fly style has no such panel, and the fly material extends back way behind the mid point of my crotch.

Unfortunately, because the standard ball pouch is so small, it still allows my balls to stick to my thighs, which is the main problem I was trying to solve by purchasing these undies. I find that they're more comfortable if I pull my balls out through the **** hole, completely separating them from my thighs. I either let them hang free or tuck the fly flap down under them if I need modesty. The bottom of that hole tugs slightly forward when I'm seated, but not enough to be uncomfortable in the standard style. This open fly style's hole is about 1/4" smaller, which makes the fit noticeably tighter. Hanging them outside does leave all of the pouch material wadded up loosely behind my **** (more so with this open fly style, of course), but that hasn't proven to be a problem.

Another difference is the style of stitching used around the fly. The standard fly style uses narrower, softer stitching that's plenty comfortable when it sits in the valley beside your ****. This open fly style uses a wider, 3-row stitch that's a little stiffer and is noticeably uncomfortable when it's tucked into that valley.

Overall, while I love the side-access "open" fly with its larger pouch, This style just has too many other problems. I'll be returning them and buying another set of standard fly boxer briefs.

Reviewer avatar
Fantastic design

Love the design of this underwear, it is on of my favorites love how it keeps my balls in one place and my sausage in another.

Precision M.a.R.
Absolutely amazing!

Love the way they fit. I was unsure when ordering if they would fit and be comfortable. Everything fits perfectly, pouch and separate front pouch , 'it' slides right into it's spot and stays there all day. Even during vigorous activity!

Kevin C.

Great feel and perfect for summer months, keeps the twig and berries cool and not sticking to my legs. Ordered the other 2 styles in different materials to make my final decision. So far I’m very pleased.

Steve M.

Since losing 30 lbs, I decided to order a new set in Mediums rather than Large. OMG...It was like I was discovering Separatec for the first time. I was excited, stimulated and supported the whole entire Day.. Thanks Guys!!!

Recently viewed products