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KORIJ SPRING INSOLES
Performance insole built with a real mechanical spring in the heel, built for explosive energy return and softer landings.
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Jump Higher
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Land Softer
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Explosive Sprints
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All-Day Comfort
"I was skeptical about the whole spring in the insole thing until I actually felt it on my first jump session. You can genuinely feel the pop off the ground."
Size Guide
Extra Small (Mens US3.5-6)
Small (Mens US6.5-8.5)
Medium (Mens US9-12)
Large (Mens US12.5-14)
Description
Capacity & Reservoir
2L wide-mouth hydration bladder with ice-ready fill opening — pack it with ice and water for cold hydration that lasts for hours, not minutes. Visible 0.5L / 1.0L fill lines let you track intake on long runs or hikes.
Fit & Stability
Dual-point adjustable straps (shoulder + side) hold the vest steady on your body — no bounce, no bladder-slap, whether you're holding pace on the road or navigating uneven trail.
Materials & Construction
Lightweight, breathable shell built to carry a full 2L load without adding pack-style bulk or weight. Durable materials designed to be the only vest you'll need to buy.
Storage
Secure compartments for essentials — phone, keys, snacks, small first-aid — beyond just your water, so you're covered for multi-hour hikes as well as shorter runs.
Who It's For
Built for runners, hikers, and cyclists. One fit system adjusts across activities and body types, so it's not a single-sport piece of gear.
What's Included
- Hydration Vest
- 2L BPA-Free Bladder
- Adjustable Straps
Care Instructions
Hand wash the bladder and shell with mild soap and water. Air dry fully before storage to prevent buildup.
Shipping & Delivery
Experience fast and reliable worldwide shipping with our products. Your order will be processed swiftly, and you can expect delivery within 5-10 business days.
45-Day Money Back Guarantee
Your trust means everything to us. We're confident you'll love our products. But if you're not 100% satisfied, we've got you covered. Simply return your purchase within 45 days for a full refund!
Research Backed Performance & Recommended by Sports Medicine Experts
"The spring mechanism in Spring Insoles offers a mechanically distinct approach to energy return compared to standard foam or flex-plate insoles. Early feedback from athletes suggests it may support more efficient push-off during explosive movements."
Dr. Jamie M, Senior Physical Therapist, Denver Voyager
What makes Spring Insoles different?
Spring Insoles use a real mechanical spring built into the heel — not a flexing plate, an actual spring engineered to compress and fire back with every stride. Paired with high-density forefoot padding and ergonomic arch support, Spring Insoles' mission is to help athletes move explosively, land safely, and perform at their best.
Mechanical Spring
Engineered to store impact energy and return it.
Ergonomic Arch Support
Built-in arch support that keeps you grounded.
High-Density Padding
Impact absorption where you need it most.
The Science Behind the Spring
Spring-based energy return isn't a new idea — it's the same principle used in running blades, pole vault poles, and suspension systems: compress under load, release on rebound.
Spring Insoles applies that same mechanical principle to the heel strike, engineered to store impact energy and return it on push-off instead of letting it dissipate as heat and vibration through foam.
Explosive Energy
In a standard foam insole, most impact energy gets absorbed and lost — the foam compresses, but it doesn't give much back. Spring Insoles replaces that dead compression with a real mechanical spring built into the heel.
The result is a noticeably more explosive takeoff on sprints, jumps, and quick starts — energy you'd normally waste is now working for you.
Softer Landings
Jumping and cutting again and again is hard on your feet. Spring Insoles handles this in two parts:
Thick padding up front: Absorbs shock from sprints and jumps.
Spring loaded heel: Takes on the heel impact instead of just deadening it.
Landings feel smooth, not harsh — so your legs hold up all practice long.
HOW DOES IT COMPARE
KORIJ
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Others
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|---|---|---|
| 2L Reservoir | ||
| Ice Compatibility (Wide-Mouth) | ||
| Stays Cold For Hours | ||
| Bounce Free | ||
| Warranty included |
45 - Day Risk-Free Trial
Your trust means everything to us. We're confident you'll love our products. But if you're not 100% satisfied, we've got you covered. Simply return your purchase within 45 days for a full refund!
FAQ
Will the vest bounce while I'm running or hiking?
The dual-point adjustable straps (shoulder + side) are built to minimize movement significantly compared to single-adjustment vests. For the most stable fit, make sure both straps are snugged before you head out — a properly adjusted fit is where this system performs best.
Can I put ice in the bladder?
Yes. The reservoir has a wide-mouth opening built to take ice directly, not just water — so you stay cold for hours instead of sipping warm water within the first mile.
Will it feel heavy with a full 2L load?
No. The vest is built with a lightweight shell specifically to carry a full 2L without the bulk or weight of a traditional pack.
How does shipping work?
We fulfill all orders within 5 business days. Once your email has been shipped, you will receive a tracking number via email and text.
Kurin will not be held responsible for any additional customs, import fees, or tax charges that may be applied upon your destination end.
Domestic shipping will generally take about 5 business days but may be subject to change based on holidays, weather, etc.
Kurin is not responsible for any address (Domestic or International) entered incorrectly by the customer.
Express shipping goes into effect after processing, and it excludes weekends and holidays
When will I get my order?
We will work quickly to ship your order as soon as possible. Once your order has shipped, you will receive an email with further information. Delivery times vary depending on your location.
Where are your products manufactured?
Our products are manufactured both locally and globally. We carefully select our manufacturing partners to ensure our products are high quality and a fair value.
Do you accept returns?
Yes we offer a 45 day money-back-guarantee. If you don't notice a real difference in your body odor, breath, or overall freshness within 45 days, we'll give you a full refund - no questions asked.
- Please email us under the "contact us" section if you would like to return your order.