Men’s | Lightweight | Full-Length

K1 Flux

Supportive Tight

$428.00 $478.00 $478.00 End of Summer Sale Sale
Black
Black
Black
Black
Black
Black

Men’s | Lightweight | Full-Length

K1 Flux

Supportive Tight

$428.00 $478.00 $478.00 End of Summer Sale Sale
Color Black
Size S

The only base layer with adjustable medical-grade knee support that's designed to help you overcome injuriesminimize pain, and get back to activity. Engineered with 90 feet of high-strength cables, adjustment dials and targeted compression, the K1 Flux reinforces the knees, hips, and lower back to keep you active for as long as possible. 

Trusted by 30,000+ customers, the K1 Flux is best for all-purpose use, with knit ventilation to keep you cool in any environment. It's lightweight, machine washable and easily wearable for any activity. 

  • Medical-Grade Knee Support
  • Ventilated Fabric & Fly
  • Full Length

Free Shipping

60-Day Risk Free Trial

1-Year Warranty

Support Cables

90 feet of flexible, high-strength cables hidden in the fabric support and stabilize your knee.

Adjustment Dials

Two dials hidden in the waistband allow you to adjust the support for any instability or activity.

Targeted Compression

Increased compression targeting the knee, improves blood flow, stability, and exercise recovery.

  • Medical-Grade Knee Support
  • Adjustable Support Dials
  • Cooling Ventilated Fabric
  • Targeted Compression
  • Full length

All-Purpose Use

  • Everyday Activity
  • Court & Field
  • Golf

Intended Use:

  • The Supportive Tight is intended for stabilization, support, and protection of the knee. 

Indications for Use:

  • Knee pain due to instability
  • Knee instability 
  • Knee ligament instabilities (mild to moderate ACL, MCL, and LCL) 
  • Knee strains and sprains
  • Knee osteoarthritis (OA) 
  • Patellofemoral pain syndrome (PFPS) 

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Material Contents

  • 79% Nylon
  • 21% Lycra

Support System Contents

  • Dyneema®: UHMWPE
  • Nylon
  • Polycarbonate
  • Polyoxymethylene
  • Polyurethane

Product Care

  • Wash in Provided Wash Bag
  • Wash on Gentle Below 40°C
  • Hang to Dry

Supportive Apparel is like nothing you've ever worn before. So before you step into your new pair of Supportive Tights, throw away your expectations on how athletic apparel should be sized. 

Supportive Apparel sizing is determined by height and weight which helps us predict both the fit of the garment and the cable support system. By using height and weight, we can accurately determine the length and position of the cable support system which is not possible with traditional athletic apparel sizing. 

Find your size with our size picker or by looking at our size chart. You can find the size picker above where it says "Find your size" next to the size selections. If you find yourself on the border of sizes, we recommend sizing up. 

Learn more about what to expect during your first wear and consult the frequently asked questions on our sizing, fit and first wear page.

The K1 Flux is designed to help you overcome injuries, minimize pain and regain the confidence to move. Intended for multi-activity use, the K1 Flux is ultra-versatile and is great for court sports, golfing, strength training, fitness classes, walking or everyday use.

The integrated Stoko Support System reinforces the hips and lower back as well as provide medical-grade support for both knees. It’s adjustable, lightweight, machine washable and provides less bulk than traditional knee braces at a fraction of the cost. Trusted by Olympians, professionals and weekend warriors, Outside Magazine praised the tight by saying it provides “Life-changing support to get people back to activity". 

Stoko Supportive Tights are priced in connection with their advanced technology, extensive research, and high-quality materials that go into their design. With features like 90 feet of Dyneema® cables and a patented support system, these tights offer a never-before-seen lower body support system, providing value that surpasses traditional athletic wear and knee braces. Trusted by professional athletes and medical experts, they deliver exceptional performance, making them an investment to stay active by helping you overcome injuries, minimize aches and pains and regain the confidence to move.

- Dual Functionality: Combines high-quality athletic tights with adjustable medical-grade knee support.

- Innovative Technology: Features 90 feet of Dyneema® cables and a patented support system.

- Full Lower body: Supports both knees, hips, and lower back, staying lightweight and machine washable.

- Endorsements: Trusted by professional athletes and recommended by medical professionals.

- Risk-Free Incentives: Includes a 60-day money-back guarantee, free shipping and a 1-year warranty. 

Why the price?

Adjustable Medical-Grade Bracing

The K1 Flux packs a lot of hidden technology and is so much more than a compression tight.

Flexible Support Cables

90ft of high-strength cables offer medical-grade bracing.

Adjustment Dials

Adjust the support in each leg for any level of instability or activity.

Flexible Support Cables

90ft of high-strength cables offer medical-grade bracing.

Adjustment Dials

Adjust the support in each leg for any level of instability or activity.

Targeted Compression

Higher compression at the knee supports faster exercise recovery.

Men's Fly

You asked for it, so we gave you easy bathroom access.

"Life-changing support to get people back to activity."

Outside Magazine

TRUSTED BY 30,000+ CUSTOMERS

Stoko's Supportive Apparel is worn by all types of active people including world-class athletes, professionals and weekend warriors looking to overcome injuries, minimize pain and move with confidence.

Confidence-Inspiring Support

Get active & stay active with support that helps you overcome injuries, minimize pain, and gives you the confidence to keep going.
Read the findings from our customer survey here.

99%

Reported
More Knee Support

89%

Reported
Less Knee Pain

80%

Reported
Hip & Back Support

MORE ACTIVITY. LESS PAIN.

“Once I tried them, I wasn’t sending them back EVER! It manages my pain so I can get back to tennis.”

- Mark, 61 Year Old, Avid Tennis Player

Bracing Without the Bulk

Supportive Apparel redefines traditional knee bracing, offering support and stabilization but with added benefits to keep you moving longer.

  • Packable
  • Comfortable
  • Machine Washable

Customer Reviews

Based on 60 reviews
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17%
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j
j.z.
Good Support

Have enjoyed wearing them on my days off for support due to a back injury on the tennis court....
Just wished they had at least 1 pocket 2 would b ideal....
So if wearing for tennis now have to wear shorts over the pants....
It looks funny but pockets are a must for tennis 🎾
Other than that I do appreciate the ajustable compression. Thx

J
J.
Backpacking 14 Days, 160+ Miles, Seven 12k+ passes in my k1 fluxes

I am extremely committed to my Fluxes, so much so that I hiked the collegiate loop in the collegiate peaks wilderness using only them.

I wore my stokos every single day, over the entire 160+ mile hike. The support they provided was incredible. Steep climbs are great when you have the support these provide, but going down steep descents are absolutely hell on the knees. I would tighten those knobs up to the support I need. When I start down, the tights just work their way into the support level needed. On the flats, I just popped those knobs out. And they would relax.

I was worried about taking them off at night. They are like a second skin and there is not a great deal of room in a tent. But they peeled off like they do normally. I kept them warm in sleeping bag footbox and they went on in the morning without difficulty. (Note these were well broken in already, so the cuffs could be spread easily to slip on over the heel)

Surprisingly, they’re incredibly durable. I did not baby them. I was on my knees cooking, setting up tents, or sitting on rocks and sticks. Not a single tear or run.

I was worried that my backpack would push against the knobs and make them uncomfortable. Or cause the knobs to bend or break. But ultimately, the knobs created a little ledge that kept the backpack from slipping down to the butt (which can happen when losing weight on the trail.)

This is colorado monsoon season. I rarely wore my rain paints because these felt like they had a DWR finish. Don’t even know if they do, but who cares. Seems like they did.

Smell. You would think that these things would stink. Everything else did. Typically after 14 days in the backcountry, everything smells like my a**. But these smelled the least. How is that possible. I don’t want to go into it, but they should have just smelled awful, but of all my gear, they held up the best.

I thought I would boil in the black leggings. But the venting was great. Worked well to keep my legs cool when moving. I will acknowledge, sitting in the sun on a mountain top, the black soaked up the heat. But nothing is perfect. I just covered them with a white t-shirt and everything was fine.

I chose the full length leggings for this trip (as opposed to the hikers) for protection against ticks. But the side benefit was the mosquitos didn’t have much success sucking blood through the fabric.

I was a little concerned about the pee hole. Walking around in public I wore shorts over them. Which is just a waste of weight. So after a while, I didn’t care and didn’t wear the shorts. Just threw them in a hiker box along the way. I will say, my um, equipment is too difficult to pull through all the underwear and then the pee hole so I never used the pee hole. Just tugged them down.

For pooping in the woods, it takes a little more time to peel these back. So planning in advance was needed.

I would have preferred no Pee hole. And a phone pocket. I have the other K1’s with the pocket, but they’re 3/4 length and I wanted full coverage for this trip. Besides those are for pickle ball.

Got my ortho to rx the stokos and insurance paid for them. How wonderful.

It is rare that everything goes as it should. But Everything was as it should be.

I remain a huge fan.

First off, what an accomplishment! Your backapck adventure sounds amazing. Stoked that we could be a small part in such a successful journey. Thank you for sharing your experience!

D
D.R.
Men's K1 Flux

I received my pair of Men's K1 Flux about a month ago. I am 6 ft tall and 190 lb. I ordered the Large and found them slightly loose in the waist after a few times wearing them. Since Stoko offered an exchange at no cost I asked for the Medium size which I received. They are tight but very wearable and I love the support they provide. Maybe in time different sizes will be available (like halfway between medium and large).
I have a knee replacement and osteoarthritis and have tried several different braces. This product has given me the best support to date providing me confidence to do more things that I enjoy.

M
M.K.
Braces Suck. Stoko Gave Me New Life on the Ice.

I sprained my left knee playing hockey last year. After missing two-and-a-half months, I came back on the ice wearing a hinged brace. I had been also been wearing a compression brace on my right knee after hurting that knee years ago. I'm known as a grinder/plumber on the ice. That damn hinged brace made me slower and very uncomfortable on the ice. Enough. A friend of mine told me about Stoko. To be honest, the price point was quite intimidating. But you know what? I need to enjoy my time on the ice. So I took the plunge and bought a pair. Best. Investment. Ever. People were noticing that I was moving faster on the ice. I felt more confident on the ice. I was getting to open spaces faster. I was having fun for the first time in almost six months, actually for the first time in a long time. Maybe that SOB who hurt my knee (he was playing recklessly) did me a favor. I love these so much that I bought another pair as I play 4x/week. Wash one, wear one. Whoever invented these things should get a medal. I can't play without my Stokos! Thank you! Thank you! Thank you!

T
Terry
Skiing

I got the Flux for skiing instead of the Summit. I skied it in 17 degrees and it wasn't a problem. Did not have other under garments on at the time. The work, support of knees and I think other parts like hips and whatnot. I personally would get the Flux for skiing. Plenty warm enough unless it gets real cold. I also skied it in spring conditions and it wasn't too hot. They are great until you have to take a poop. Real pain then.

STILL HAVE QUESTIONS?

Stoko accepts returns & exchanges within 60 days of the purchase date. 

We encourage you to put your Supportive Apparel to the test before deciding to return. Move in them, get sweaty, and give them all you got. There is a short break-in period with your Supportive Tights. This means it will take a bit of time before your tights begin to regulate and feel comfortable on your body. They can be a total pain at first and challenging to get used to, Supportive Apparel is very different than any other tights or braces you’ve tried. 

View Full Policy Terms

Stoko offers shipping within North America, please note that order processing may take an additional 1-2 business days from the stated shipping times below:

  • Standard 4-7 Business Days
  • Expedited 3 Business Days
  • Express 1-2 Business Days

International Shipping

At this time, we cannot ship or sell Stoko products outside of North America. Please feel free to sign up for our newsletter to keep up-to-date as we continue to grow.

More information here

Our products are registered as Class 1 Medical Devices through Health Canada and the FDA, which means that all our products are eligible for reimbursement through Health Spending Accounts (HSAs) and Flex Benefit Plans by all Canadian insurers, as well as some carriers in the U.S. This allows many of our customers to get their K1s free of charge or receive partial reimbursement.

Learn More

All Stoko products provide the same medical-grade bracing support, leveraging our Stoko Support System technology. It is really up to your personal preference what style would suit you the best!

All-Purpose: Both the Supportive Tight and K1 Flux are engineered to deliver support in a variety of activities and is our most recommended product for all-around use. From everyday activity to court sports to golf, the K1 Flux and Supportive Tight can do it all while also keeping you cool with knitted ventilation.

Ski & Snow: K1 Summit is engineered to deliver support and warmth. It was designed for snow sports, such as skiing, snowboarding, and cross-country skiing.

Run & Hike: K1 Tempo is engineered to deliver support and keep you cool in warm environments, such as: running, hiking, and training.  

Similar to other traditional/medical grade knee braces, the Supportive Tight provides support and stability to the body in compromised knee positions; however, the Supportive Tight achieves these outcomes through different means. The Supportive Tight relies on tension throughout the Stoko Support System to generate support, which is made up of cables that are integrated into the tights. The result is support that moves with your body and doesn’t compromise on comfort, aesthetics, or support.

Learn More Here

You can reach our Support Team at hello@stoko.com!

Stoko Support Center