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.
$18.00
$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.
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Dual-adjustment
system for a locked-in, ergonomic fit
-
Sweat-Proof phone pocket
+ internally separated essentials storage
-
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
-
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
-
SickFit socks
meet color and length requirements with added performance support
-
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.
