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Athlete using KYLA palm cooling device between training efforts to regulate temperature and maintain output

YOUR LAST EFFORT, CLOSER TO YOUR FIRST.

A handheld tool. Held between efforts. Pulls heat out. Keeps your output.

See KYLA Performance

Test results as they land, and word when the First Run opens. No noise.

90-day money-back guarantee.

What it does

  • You hold your output longer across repeated efforts.
  • You get more out of the rest you already take.
  • You feel the drop later, instead of early.

When you train hard, your body heats up. That heat is not just discomfort. It is one of the first things that pulls your performance down, and it starts before you feel tired.

KYLA Performance works in the gap you already have. Between sets. Between intervals. Between rounds. You hold it in your palms during that rest, and it draws heat out of your body. You start your next effort cooler, and closer to full.

Recovery

Deeper heart-rate recovery between efforts.

Fatigue

Lower blood lactate at matched pace.

Output

Output held across repeated efforts.

The numbers, and how we got them

Where these numbers come from

Recovery

Up to 50%

deeper heart rate recovery between efforts

Measured from heart-rate data athletes recorded in their own training, comparing the same sessions with and without KYLA at the same pace and workload.

Fatigue

Up to 25%

lower blood lactate at matched pace

An early signal, not a finished result. Recorded by one athlete sampling his own blood lactate at a matched pace. A single data point we are now testing at scale.

Output

5 to 12%

higher output across repeated efforts

An estimate, not a direct measurement. Based on the recovery athletes recorded and the established link between thermal recovery and work capacity. The study with Umeå University will test it directly.

These are measured ranges, not guarantees. What you get depends on you.

See the full methodology →

The tool does not replace the work. It lets more of the work count.

How it works

How it works

KYLA is not about cold. It is about heat, and where it goes. When you train hard, your body builds heat faster than it can clear it, and that heat starts pulling your output down before you feel tired.

Your palms are one of the places your body sheds heat fastest. KYLA sits in them through your rest and draws that heat out, at a steady, controlled rate, for as long as the break lasts. It is not an ice pack. It is engineered heat transfer.

The mechanism, in full

How KYLA moves heat

Heat is energy, and energy is never created or destroyed. It can only move from one place to another. KYLA does not lower your temperature by a trick. It gives the heat your body is carrying a fast, direct place to go.

Your palms are built for exactly that. The skin there is glabrous, hairless and smooth, and just beneath it sits a dense bed of blood vessels that your body opens up to release heat. The palm is one of the control points your body uses to manage its own temperature. It is the reason cupping your hands and breathing into them warms them in seconds. Heat moves through the palms fast, in both directions. KYLA runs that exchange the other way.

This is also why KYLA is not an ice pack. An ice pack is a cold surface. It numbs your skin, warms up quickly, and does little for the heat that actually matters, the heat your blood is carrying. KYLA is engineered to move heat at a steady, controlled rate, for as long as a real rest period lasts. Cool the blood passing through your palms, and you cool the blood that runs back through the rest of you.

Getting that rate right took years and hundreds of prototypes, with materials developed specifically for this product. The design is patent pending. It is made in Germany. That is why it is a tool, and why it is priced as one.

Most cooling methods cool your skin. Only a few cool your core.

Calculated estimates from our lab measurements, not competition results. Modelled over a 60-minute session: 15 cycles of 3 minutes work and 1 minute cooling, at 25 °C ambient

KYLA is built around three things:

Heat transfer rate, not temperature.

The 14 °C window, where the body keeps blood flowing.

Glabrous skin on the palm.

CORE HEAT EXTRACTION OVER ONE SESSION

Cooling methodCore heat removedvs KYLA
KYLAPalm contact, 14°C surface, 60 s per cycle54 kJ 100%
Cooling vest15 to 20°C, worn continuously35 kJ 65%
Ice bag in palm250 g, 60 s contact per cycle9 kJ 17%
Ice bag on neck250 g, 60 s contact per cycle4 kJ 7%
See the method behind these numbers →

The method, in full

How we modelled the comparison

What we measured: core heat, not skin heat

The metric throughout is heat physically removed from the body's core: the deep tissues, the blood, and the organs. It is not the heat absorbed by the cooling source.

A cold object can absorb a lot of heat without that heat coming from your core. If most of what it absorbs is local skin or local tissue, the body simply rewarms that area from the core afterwards. The net effect on core temperature is small.

That distinction explains most of the differences in the table.

Perceptual cooling vs core cooling

Cooling methods do not all do the same thing. There are two jobs.

Perceptual cooling is what you feel. Cold on the neck, the wrists, or the chest registers as strong relief. It lowers perceived effort, makes the same workload feel easier, and can lower sweat rate. That is real, and it is why athletes use those methods. But it is decoupled from how much heat actually leaves the body. The athlete feels significantly cooler than they actually are.

Core cooling is the other job, and the harder one. It is heat physically removed from the deep tissues, the blood, and the organs. It is the temperature that limits performance, and it is what this table measures.

KYLA delivers both. The palm is one of the most thermally sensitive surfaces on the body, so cold contact there lands as immediate relief, the felt experience our athletes describe. And because the palm is glabrous skin, that same contact also moves real core heat through the AVA network. One surface, two jobs.

Most methods give you only one. KYLA gives you both.

Limitations

These figures are modelled, not directly measured in a controlled calorimetry experiment. We have a first-principles thermodynamic model and a ±20% uncertainty band on most rows.

Direct calorimetric validation of KYLA against the comparison methods is planned, and we will publish those numbers when they are available. If you want the underlying calculations or to discuss the methodology, get in touch.

The session

This comparison uses a single 60-minute training session, structured as 15 cycles of 3 minutes work followed by 1 minute of cooling. Ambient temperature is 25 °C, typical of indoor training or moderate outdoor conditions.

Each method is applied during the 1-minute rest where it makes sense. Continuously worn methods, like a cooling vest, ignore the cycle structure and apply throughout.

The athlete in the model is heat-stressed: core temperature about 38.5 °C, palm skin about 36 °C, neck and torso skin about 34 °C. These are realistic values for someone 20 to 30 minutes into hard interval work.

Where matters more than how cold

The body has dedicated heat-release channels in glabrous skin: the palms, the soles, and parts of the face. These contain arteriovenous anastomoses (AVAs), specialised vessels that act as direct radiators for core blood. When open, they can move enormous amounts of heat per cm² of contact.

Non-glabrous skin (neck, torso, forearm) lacks these channels and couples poorly to the core. Cooling it mostly cools the local tissue, which the body rewarms from the core later.

The numbers make this concrete. A cooling vest covers roughly 8,000 cm² of torso skin. Two palms holding KYLA cover about 200 cm², roughly forty times smaller. But per cm² of skin contact, the palm can move on the order of fifty to a hundred times more core heat. That is the AVA mechanism, in numbers.

This is why ice on the neck, despite being very cold and having lots of surface area, removes very little core heat. And why a small palm contact in the right place can match or beat a vest forty times its size.

Why colder is not better

Below about 14 °C surface temperature, the body shuts down local blood flow as a protective reflex. Ice at 0 °C on the skin paradoxically removes less core heat than a properly-tempered 14 °C surface, because the very cold surface triggers the body to halt the blood flow that delivers core heat to the cooling surface in the first place.

KYLA's design holds its surface at the 14 °C plateau deliberately. Cold enough to drive heat transfer, warm enough to keep the body's heat-release channels open.

How each method was modelled

KYLA (two hands). Palm contact at 14 °C, 60 W sustained per cycle. The phase-change material (PCM) inside stores enough cooling capacity for all 15 applications, with margin.

Cooling vest. PCM at 15 to 20 °C, worn continuously. Modelled against published research on cooling vest performance (Reilly & Cable, Bongers, Pryor, Schauer & Stevens).

Ice bags. 250 g of ice in a thin plastic bag, 60 s contact per cycle. Includes both heat absorbed from skin contact and from ambient warming between uses.

Who uses it

KYLA Performance is already in the hands of athletes who train for repeated efforts.

Harry Lightfoot

CrossFit

Harry Lightfoot

11th Fittest Man on Earth, top-ranked European Male in CrossFit.

"KYLA has become one of my most used training tools to recover within sessions and bring more intent to what I'm doing."

Jeppe Risvig

Running

Jeppe Risvig

1500m in 3:41 & 10k in 29:30

"I ran quicker than usual with measurably lower lactate. Heart rate was the same. The feeling was different, like the same work cost less. I do this session three times a week, so I trust the comparison."

Pelayo Menendez Fernandez

HYROX

Pelayo Menendez Fernandez

Elite 15, Former triathlete

"I've noticed several significant positive changes in my training. Better repeatability between intervals, more stable output, and faster recovery between hard efforts."

See all athletes →

How you use it

01

Finish your effort.

A set, an interval, a round.

02

Hold KYLA in your palms through the rest.

No screen, no batteries. You chill it, then you hold it.

03

Start your next effort cooler.

Then do it again.

It does not add a step to your training. It uses one you already take.

What you get

What you get

Every order is one pair. No batteries, no refills, nothing to subscribe to. You buy it once and own it for years.

$475.00for the pair

In the box

  • 2 x KYLA Performance units
  • 1 x Clip
  • 1 x Dust bag
  • 1 x Brand book

First Run ships October 2026 to the EU and Norway.

Reservations are for the First Run. A second run opens once it ships.

See KYLA Performance

Test results as they land, and word when the First Run opens. No noise.

90-day money-back guarantee, counted from delivery. We email you a week before shipping to confirm your order.

First Run ships October 2026
90-day money-back guarantee
Designed in Sweden. Made in Germany.

Questions

Is this just an ice pack?

No. An ice pack is cold on the outside and warms up fast. KYLA is built to draw heat at a steady rate for the length of a real rest period. What matters is how fast it moves heat, not how cold it feels.

When does it ship?

The First Run ships October 2026, and we confirm the shipping window with reservation holders before anyone else. The Founders Edition, 100 pairs, goes to hand-picked athletes and is not for sale.

What if I change my mind?

You get a full refund anytime before your order ships. No questions asked.

Why two?

One for each palm. You use both at once, and the price is for the pair.

Does it work for my sport?

It is built for any training with repeated hard efforts and rest in between. Intervals, sets, rounds, repeats.

Output drops before you do. KYLA holds it up.

See KYLA Performance

Test results as they land, and word when the First Run opens. No noise.

90-day money-back guarantee.