Endorphin x SickFit
Two brands built for the miles that break most gear.
Endorphin was created to eliminate bounce and distraction to push you further. SickFit was built to hold up when your body is breaking down. Zero-bounce carry meets performance compression: one system for long miles.
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proof of performance
Trusted by 15k+ Runners
Durability
Performance
Compression
Different gear. Same standard. One mindset.
Small inefficiencies compound.
- Movement lost to instability.
- Fatigue built over time.
- Gear that loses its shape, its support, and its purpose.
Both brands were created to solve those problems so you can stay focused when the work gets hard.
This collaboration brings that standard together.
- No unnecessary movement.
- No breakdown in support.
- No weak points in your setup.
Just gear built to hold up when it matters. Step after step.
Lock In Your Entire Setup
Trusted by 15k+ Runners
Lock In Your Entire Setup
Trusted by 15k+ Runners
The Endorphin Belt + Soft Flask + SickFit Compression Socks. Available for a limited time!
Dual-adjustment belt delivers a locked-in, bounce-free carry with intentional storage for phone, fuel, and hydration.
Custom-built 450ml soft flask compresses as you drink to reduce movement and deliver fast, leak-resistant hydration.
SickFit performance socks are built for hard efforts and long days on your feet delivering compression, durability, and impact protection that holds up mile after mile.
Engineered to work together to eliminate bounce, reduce fatigue, and keep you moving efficiently.
GET THE LIMITED BUNDLE WHILE SUPPLIES LAST!
Free US shipping over $60
30-Day Risk Free
Veteran owned and operated
What’s Included
Soft Flask
3x SickFit Socks
Frequently Bought Together
SickFit Classic Compression Socks – Everyday Crew Performance Fit
Classic Comfort. Compression that works.
$15.00
SickFit Compression Light Weight Boot/ PT Sock – 670-1 Compliant Performance Fit
Mission-Ready. Field Tested.
$45.00
A complete system designed for stability, support, and durability across every mile.
ENDORPHIN BELT
- Waterproof phone pocket fits all major smartphones with internal organization for keys, cards, and essentials
- Dual-adjustment system distributes weight evenly for a secure, bounce-free fit even when fully loaded
- Rear hydration pouch stretches to securely hold bottles, soft flasks, or layers up to 17oz
- Two nutrition loops for gels, bars, or salt tabs
- Two low-profile accessory pockets for additional storage
- Lightweight (4.4 oz) for all-day comfort at any pace
- Slim, streamlined profile that eliminates bulk and movement
SOFT FLASK (450ml/15oz)
- Flexible design compresses as you drink to reduce movement
- High-flow, self-sealing bite valve
- Twist-to-lock cap for added leak protection
- BPA-free, odor-resistant materials
SICKFIT COMPRESSION SOCKS (3 Pack)
- Targeted arch compression for support and fatigue reduction
- Reinforced heel and toe for durability in high-wear zones
- Moisture-wicking, breathable fabric
- Cushioned footbed for impact absorption
- Mid-calf length, all-black design
SYSTEM BENEFITS
- Eliminates bounce and movement
- Maintains support over long efforts
- Built for running, rucking, and extended wear
- Performs consistently under load
- AR 670-1 compliant and approved for military use
Includes 3 pairs of SickFit one-size performance fit compression socks.
Men’s sizes 7–13
Women’s sizes 8–14
The stretch-knit compression material is designed to adapt comfortably to a wide range of foot and calf sizes while maintaining support during movement.
- Free shipping and returns in Continental US over $60
- 30-day risk-free trial
Locked-In, Bounce Free
Meticulously packed with features so everything has a place. Designed for stability, comfort, and speed.
-
Dual-adjustment
system for a locked-in, ergonomic fit
-
Sweat-Proof phone pocket
+ internally separated essentials storage
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Hydration-ready rear pocket
designed for a 17oz bottle (and most soft flasks)
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Nutrition loops
+ accessory pockets for instant access
Built For When the Work Gets Hard
Compression, durability, and support that holds from mile one to the finish line.
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Targeted arch compression
stabilizes the foot and reduces strain
-
Reinforced heel and toe built
for high-wear zones
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Cushioned footbed
absorbs impact and returns energy
-
Moisture-wicking, breathable fabric
keeps feet, dry, cool, and comfortable under load
-
No-slip rib construction
stays in place without tight, restrictive pressure
-
Designed for running, rucking, training,
and extended time on your feet
Drink Without Breaking Stride
Quick, reliable hydration when effort is high.
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Soft, flexible design
compresses as you drink to minimize movement
-
High-flow, self-sealing bite valve
for fast hydration
-
Twist-to-lock cap
adds leak protection during hard efforts
-
BPA-free, odor-resistant materials
built for frequent use and refills.
-
Shaped to fit securely
in the Endorphin Belt for stable, hands-free carrying.
AR 670-1 Compliant
Built to Army standards without sacrificing performance.
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Authorized for wear with Army PT uniform
(all-black, low-profile design)
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Endorphin Belt
fits within regulation width and appearance standards
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SickFit socks
meet color and length requirements with added performance support
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Built for running, rucking, and extended wear
in boots and shoes
-
Securely carries essentials
like phone, nutrition, and hydration to support safety and performance during training
FAQ
Frequently Asked Questions
The bundle includes the Endorphin Belt, a custom-built 450ml soft flask, and 3 pairs of SickFit black compression socks.
The compression is designed to support circulation and reduce fatigue without feeling restrictive. Comfortable for long efforts, recovery, or all-day wear.
When properly adjusted with our dual adjustment system, the Endorphin Belt will not bounce.
The sweatproof pocket fits all modern smartphones including the iPhone Pro Max and Samsung Galaxy Ultra.
The bundle includes 3 pairs of SickFit one-size performance fit compression socks designed to fit most runners comfortably.
Men’s sizes 7–13
Women’s sizes 8–14
The flexible compression knit adapts to a wide range of foot and calf sizes without losing support.
The socks are built with durable performance fibers and reinforced construction to maintain shape and compression wash after wash. For best results, wash cold and air dry.
A self-sealing bite valve and twist-to-lock cap help prevent leaks, even during hard efforts.
We are confident you will love it, and offer a no-questions asked 30 day return policy. If you don't like it for any reason, let us know and we will work to make it right.
Customer Reviews
Overall rating: 4.9 / 5 from 296 reviews.
Got my first pair of Sickfit socks at a military work event. Since then I’ve been swapping out my Nike socks for Sickfit socks. We have the ankle, quarter, crew, and the Black History month socks. They don’t slip, offer great support, and are super comfortable. Hands down Sickfit socks are the best socks I’ve ever had!
SickFit Ankle Compression Socks – 6 Pack Ankle Performance Set
Store owner replied: Appreciate you taking the time. Glad they’re holding up on the long shifts.
I am type 1 diabetic and I love these socks! I wake up in the middle of the night and my feet don't tingle anymore! My feet feel less tired.
Store owner replied: This is exactly who we built these for! Thanks for the review.
Love the socks from unit pride in the 82nd
SickFit Mil Socks- 101st Airborne Division
Store owner replied: Appreciate you taking the time. Glad they’re holding up, thanks for the review!
I really love them
Legacy Compression Sock 2-Pack – Limited Edition Tribute Performance Socks
Michael Jackson: activate
SickFit Classic Compression Socks – Everyday Crew Performance Fit
Hands down the most comfortable sock I've ever wore. U will be purchasing more soon!
Legacy Compression Sock 2-Pack – Limited Edition Tribute Performance Socks
My box arrived sooner than I expected! I was shocked because I thought I’d be waiting much longer for the package, but we were both eager for the perfect fit. I love how breathable they are. Two pairs from the crème pack that was gifted to me accompanied me on my trip from Minnesota to Seattle, Washington. During the 6-hour flight to and from, even in the compact cabin, my foundation was well taken care of by SickFit. I’ll definitely be purchasing again!
Absolutely love my new SickFit jacket! It’s incredibly cozy + comfortable and perfect for everyday wear. The fit is just right, and it keeps me warm without feeling heavy.
comfortable
SickFit Essential Ankle Compression Socks – 6 Pack Ankle Performance Set
Soft and cozy
These socks are amazing! They fit well, they aren’t too thick and the All American logo looks sweet. Thank you so much!!
It's my first time wearing a pair but they feel very good & quite comfortable considering they are compression socks. I'll do ALMOST anything for JSU because "Thee I Love" is really more than words in our song to many Alumni!❤️🐅💙🤍
Love the socks!!! I have back problems which affect my legs and feet. These socks have provided me added comfort when walking. Plan to purchase additional pairs in other colors
Better than advertised. Like someone else said, was buying to support, but was amazed at the quality and how they turned out. Ended up buying another pair.
I love the socks. I gave my Mom the white pair and she love them.
I had to take a moment to show some love. I ordered the KC 1400 socks and I’m genuinely impressed! The fit is perfect, the material feels premium, and the comfort level is next level. They are supportive without being too tight, breathable, and they just feel good on your feet all day. What makes it even better is what they represent. As a JSU fan, it means something to be able to wear an esteemed brand that proudly showcases the KC 1400 brand. They are more than just socks — it is pride, culture, and excellence wrapped into one! 💯 Huge thank you to the owners and innovators for the collaboration and for giving JSU fans and supporters the opportunity to rock a brand that stands for quality and representation. I am definitely rocking mine with pride! 🐯 🧦 🔥
This months sock subscription came with the BHM two pack!!! Absolutely incredible. Some amazing and predominant figures within the black community. Love the support, and love to support. 🙏🏼🙏🏼
Every sock you need in the lineup!!! Curated to perfection.
Best sock on the market!! They’re super comfortable, durable, and perfectly cushioned. Even after a couple wears, runs, lifts, and wash cycles. They feel the same as if you pulled them off the pack.
Best socks in the game 🤮🙌🏾🔥
Nice new socks. They are very comfortable when I walk or play racquetball.
Legacy Compression Sock 2-Pack – Limited Edition Tribute Performance Socks
I put the SickFit Essential Crew Socks to the test today, and they absolutely delivered! The cushioning stood out, feeing soft without being bulky and responsive without feeling thin. That perfect balance that keeps your feet comfortable but still locked in. As the miles stacked up, so did the sweat… but you wouldn’t know it. These socks are seriously sweat-resistant. No soggy, heavy feeling. No slipping. Just dry, consistent comfort. The breathability is next level. If you’re logging miles, lifting heavy, or just want everyday comfort that performs like it should then the SickFit Essential Crew Socks are a must have. Comfort. Performance. No distractions. 🧦
Hands down the best socks i put on ever , recently made a collab that featured these socks , and let me tell you … I am beyond satisfied with this product. Check out my product review video on instagram @ Benzo2fit
Love these Breast Cancer Awareness socks. Great fit, breathable, durable, and the support my feet receive now from working on my feet for long hours is noticeable! Also, love that a percentage of the proceeds went towards a cause!
I love these compression socks for playing tennis and every day wear. They have energized my feet and help with over all confidence in my life!
Classic Performance Compression Socks – 6 Pack Crew (15-18mmHg)
Got these 4 years ago ! They still feel like a fresh pair of socks everytime I put them on ! Perfect on run days!!
HANDS DOWN BEST COMPRESSION SOCK EVERRRRRRRRR
Legacy Compression Sock 2-Pack – Limited Edition Tribute Performance Socks
These are so soft and thick. They are stylish too!
Top socks of the market
Amazing feeling!! Love these
These slouch socks are pretty cozy and comfortable! They keep my feet warm with plenty of cushion.
Super comfortable! Thick material 🥶
These socks are so snug and comfortable!! I had been wanting to try them for a while and to my very pleasant surprise, I was able to actually meet the owner and was gifted my first pair for free!!!! She was so dope too! I’m definitely buying more and would recommend. Also, side note: the socks have a R and L on them to make sure you have them on the correct foot, so don’t be like me and put them on backwards haha. I didn’t realize there was such a thing as backwards socks until sickfit! 🤣🤣🤣 But seriously, get you some!!!
SickFit Classic Compression Socks – Everyday Crew Performance Fit
Love these socks great investment. Feel the difference immediately!
Love my Sickfit socks! They are super comfortable to wear on the court. Thick and supportive but doesn’t make you feet slide in your shoes during cutting motions on the court. Thank you sickfit!
The socks are so comfortable! I wear them to play tennis but also wear them on long days at the hospital. Need to get more asap.
SickFit Classic Compression Socks – Everyday Crew Performance Fit
What a way to celebrate Black History! 💚❤️🖤I love the feel and compression. I have plantar fascists and I require support in my arch especially while I am playing tennis. Just enough compression that I feel supported and my feet do not hurt after playing for multiple hours. A great addition for my sock collection.
Legacy Compression Sock 2-Pack – Limited Edition Tribute Performance Socks
The most comfortable/durable socks I’ve ever owned. I workout 5 times a week and there’s never a day that I don’t have a pair of these in my feet. I’m a sneakerhad and I absolutely love the colorways that I can match my kicks with. I can’t wait to see more in 2026.
Do I need to say more? These go with literally anything you wear. The comfortability, the amazing compression not to much not to little, literally just perfect. A great investment 10/10
These have been my ABSOLUTE FAVORITE! You know when you purchase a coat, or a favorite dress, or a pair of pants and they fit LIKE A GLOVE?! These right here are my favorite go to in my military uniform. They’re absolutely comfortable and my feet don’t sweat like crazy in them! I highly recommend these for all my military folks 10/10!
SickFit Compression Light Weight Boot/ PT Sock – 670-1 Compliant Performance Fit
