Premium in-race cooling · Pre-order
Cool head.
Higher ceiling°
Your body quits before you do. KELVIN is a stick-on cooling element you snap to activate on your neck, so you keep your grip when everyone else fades.
Top 3 products
Our best-selling performance enhancers
KELVIN ONE
€29,00 €39,00
Cool head. Higher ceiling. Your body quits before you do. Above 39-40C core temperature, your nervous system throttles...
KELVIN PRO
€39,00 €49,00
Cool head. Higher ceiling. Your body quits before you do. Above 39-40C core temperature, your nervous system throttles...
KELVIN PACK
€89,00 €119,00
Season multipack, 10 elements (mixed ONE + PRO), the lowest price per race.
01 — The problem
The brake is in your brain
Above 39 to 40°C core temperature, your nervous system throttles your muscles to protect you. Your pace drops, your heart rate spikes and your head still wants more. That is not weakness. That is a brake.
02 — How it works
Snap. Cool. Go.
One deliberate move, right when you choose. No towel, no melting ice. A switch.
Stick it on
Place the element on your neck near your thyroid, the thermostat of your body, fixed with the thin elastic sports tape.
Snap to activate
Break the element so it turns fresh inside. Cooling starts on demand, exactly at the moment you decide.
Keep pushing
The cold signal lowers your head perception, so your brain gives the green light to keep working at the same effort.
03 — The science
Proof, not hype
Neck cooling works mainly through perception. It lowers the heat signal to your brain and delays central fatigue, so you push harder at the same effort.
- ›The brake is central. Above 39–40°C your nervous system cuts muscle efficiency to prevent overheating.
- ›The neck is the spot. High thermoreceptor density near large blood vessels makes it the fastest signal to your brain.
- ›On demand. Snap-to-activate means cooling lands in the second half, where the race is won or lost.
04 — Pre-order
Lock your founder's price
Pre-order now. You secure the first-wave price and we email you the moment Kelvin patches are shipped.
KELVIN ONE
Single-race starter · Try it on your next event.
3 elements · €7 per race
- ›3 cooling elements
- ›~30 min active cooling each
- ›Elastic sports tape included
KELVIN PRO
Longer cooling duration for ultra and trail.
3 PRO elements · €13 per race
- ›3 PRO elements, longer cooling
- ›~45 min active cooling each
- ›Built for long, hot efforts
KELVIN PACK
Season multipack. Best value per race.
10 elements · €8,90 per race
- ›10 cooling elements
- ›Mixed ONE + PRO option
- ›Lowest price per race
Prices and specs are a proposed pre-order structure. Cooling duration, pack contents and delivery date are to be confirmed.
Built for the second half
05 — Athletes & creators
Become a KELVIN athlete
Endorse the cooling that removes the brake
We are picking a first wave of Hyrox and endurance athletes to put KELVIN to work and tell the story. Early access, your code, real input on the product.
- ›Free first-wave product before launch
- ›Your own discount and affiliate code
- ›Direct line to the founders on the roadmap
Apply in 30 seconds
Join the first wave
Drop your email to be first in line to boost your performance with KELVIN.
FAQ
Good to know
When can I actually buy it?+
You can pre-orders now to lock in the founder's price. Or join the waitlist - we email you the moment stock is available for delivery.
Does cooling really make me faster?+
In a time-trial study, runners covered +10,5% more distance with neck cooling. It works mainly by lowering the heat signal to your brain and delaying central fatigue.
Where do I wear it and how does it activate?+
On the neck, near the thyroid — your body's thermostat. Fix it with the thin sports tape and snap the element to activate cooling on demand.
Is it safe and single-use?+
Each element is a single-use, skin-safe cooling pad. Full material specs are confirmed before launch.
I am an influencer. How do I work with you?+
Apply as a KELVIN athlete above. We pick a first wave for free product, an affiliate code and a direct line to the founders.