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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 Power
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Full-Game 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 | US 3.5–6 | UK 3–5.5 | EU 35.5–38.5 | CM 22–24.5
Small | US 6.5–8.5 | UK 6–7.5 | EU 39–42 | CM 25–26.5
Medium | US 9–12 | UK 8–11 | EU 42.5–46 | CM 27–30
Large | US 12.5–14 | UK 11.5–13 | EU 47–48.5 | CM 30.5–32
Description
Spring Insoles is a performance insole built with a real mechanical spring in the heel — engineered to compress on impact and fire back on push-off, giving you explosive energy return, softer landings, and more stability on every rep. Paired with high-density forefoot padding and ergonomic arch support, Spring Insoles is designed for athletes who jump, sprint, and change direction — basketball, volleyball, football, and beyond.
No fitting quiz, no break-in period. Just drop it in your shoe and feel the difference on your first jump.
What's Included:
- 1 pair of Spring Insoles performance insoles (heel spring + forefoot padding + arch support)
- Sizing insert/trim guide for a custom fit
- Limited-time offer: Buy 1, Get 1 Free — get a second pair free to keep in your game shoes and practice shoes, or share with a teammate
Fit:
Available in Extra Small through Large — see size guide for exact US/UK/EU/CM measurements before ordering.
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.
90-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 90 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
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.
Try them for 90 days. Don't feel the KORIJ Difference,
Get a Full Refund. No Questions Asked.
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.
FAQ
Will Spring Insoles fit inside my existing shoes?
Spring Insoles are designed to fit most athletic shoes. Simply remove your factory insole and swap in Spring Insoles using our size guide (based on standard Men's US shoe sizing) to find your best fit.
Are Spring Insoles suitable for all sports?
Spring Insoles are built for athletes who sprint, jump, and change direction quickly — basketball, volleyball, football, and similar high-impact sports. The spring mechanism and dual-zone cushioning are engineered to support explosive movement and repeated landings across these activities.
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.
Do you accept returns?
Yes we offer a 90 day money-back-guarantee. If you don't notice a real difference in your body odor, breath, or overall freshness within 90 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.
J
Highly recommend these to anyone who wants more support, softer landings, and better performance.
E
My shoes feel much more comfortable now.
M
The heel spring gives every step a little extra bounce.
A
I recover faster after workouts now.
O
The spring heel feels surprisingly natural and adds a nice bounce to every step.
C
Delivery was forever. And due to the fact i have to cut it to fit my shoes 🤦♀️
D
Unfortunately, these insoles weren't the right fit for me. They felt uncomfortable in my shoes, and I didn't notice the improvement in performance that I was hoping for.
S
The support is decent, though I didn't notice as much improvement during training as I had hoped.
K
I like the extra cushioning, but it took some time to get the fit right in my shoes.
B
The insoles feel well made, but they were a little firmer than I expected.
A
Overall, they're decent insoles, but they weren't quite as responsive as I was hoping.
J
I like the extra cushioning, though I expected a little more support during longer runs.
N
They make my shoes more comfortable, but I didn't notice a huge difference in my performance.
E
The quality is good, but the fit required more trimming than I anticipated.
G
The insoles are comfortable, but it took a few workouts to get used to the spring heel.
A
The quality feels durable, and they've held up well through regular training.
P
A solid choice for athletes looking for more comfort and support during training.
E
They absorb impact well and help reduce foot fatigue after exercise.
J
Overall, they've been a great upgrade for my running shoes.
R
I like the extra cushioning and overall stability they provide.
J
The arch support is excellent, and they fit well after trimming.
C
These insoles made my athletic shoes much more comfortable.
C
The spring heel adds a nice responsive feel while sprinting.
S
Very comfortable for basketball and gym workouts.
R
Great support for running and jumping without making my shoes feel bulky.
T
The insoles are very comfortable and provide great cushioning during workouts.
X
The comfort and responsiveness make every workout more enjoyable.
H
I noticed my landings feel softer, especially after longer training sessions.
C
These are easily the best insoles I've ever used.
B
Perfect for anyone looking to upgrade their athletic shoes.
C
My feet, ankles, and knees all feel less stressed after training.
I
They fit securely without sliding around.
D
Very impressed with the build quality.
A
Great for improving overall comfort during sports.