The TEMP-ERA™ science
Why an ice pack burns and then gives up, and why a fusion cold holds for 3 hours without ever attacking the skin — from the physics of phase change to human performance.
Hippocrates was already using snow to ease pain. We just made it a little more organized.
01The starting point
It all starts with a distinction that conventional gel packs ignore — and that TEMP‑ERA exploits.
State variable — in °C
A characteristic of a system, like altitude or pressure.
It can't be exchanged — you can't “give away” degrees.
It can't be stored — you can't build up a reserve of °C.
Energy — in calories
A form of energy that flows between bodies.
It is exchanged — it's what passes from your skin to the pad.
It can be stored — and that's where everything plays out.
| Raising the temperature of 1 g of liquid water by 1 °C | 1 cal |
| Raising the temperature of 1 g of ice by 1 °C | 0.5 cal |
| Melting 1 g of ice at 0 °C — without changing its temperature | 80 cal |
A phase change absorbs 80 times more energy than a simple temperature change.
“No effective cold
without a phase change.”
A conventional gel only drops in temperature: its cold reserve runs out within minutes. TEMP‑ERA stores its cold in melting ice, at the core of the pad — a reserve 80 times denser, released slowly.
02The phase change, live
Same heat received from the body, two opposite behaviors: “temperature-based” cold drifts within the first minutes; fusion cold doesn't budge as long as there is ice left to melt.
Ice cube / conventional gel
body heat
device temperature
cold reserve
The entire reserve is gone within the first minutes — too cold at first, lukewarm after.
TEMP-ERA™
body heat
pad core
remaining ice
As long as there is ice left to melt, the core stays at 0 °C. 80 calories per gram, released slowly.
03How heat travels
It all depends on how heat travels through matter.
Matter is in continuous motion: the liquid churns, the temperature evens out.
Result: an ice-cold liquid attacks the skin with its full mass, all at once. That's brutal cold — the kind that burns.
Matter is still: heat propagates step by step, along a temperature gradient.
Inside the pad, the water is trapped in the cryotherapy compound: it cannot circulate. Heat transfer happens by conduction only.
A temperature gradient therefore forms between the inside of the compress, at 0 °C, and the surface of the skin, held between +5 °C and +12 °C. The cold works deep, and is never harsh at the surface — no protective barrier needed.
04On the skin
Measured at skin contact, a TEMP‑ERA cycle always unfolds in three stages.
Illustrative curve of a treatment cycle — skin temperature, temperate ambient conditions.
Within about ten minutes (±5), skin temperature drops below +12 °C. The cold sets in fast — without ever going below +6 °C (±1 °C).
Skin temperature is held below +12 °C for 1 to 1.5 hours. The cold penetrates 2 to 4 cm into the tissues — well beyond the subcutaneous layer.
The pad slows the tissues' return to temperature for another 1 to 1.5 hours. The effect lasts well beyond the peak of cold.
05The engineer's argument
The therapeutic benefit doesn't come from maximum cold, but from cold held at the right level. That is exactly where ice fails: its temperature drifts continuously, from too-cold to lukewarm.
Starts too cold — below 0 °C at contact: burn risk, protective barrier required.
Drifts continuously — the temperature changes by the minute: an inconsistent therapy, impossible to protocolize.
Melts and gets replaced — effectiveness in free fall, constant logistics.
Controlled thermal profile — set by the compound's formulation, adjustable to the degree for each use.
Stable heat extraction — hours in the same window: a predictable treatment, repeatable results.
Reusable — the same performance, cycle after cycle.
Illustrative curves — temperature at skin contact, temperate ambient conditions.
06The physiological effects
Four recognized effects of contact cryotherapy — all delivered by a controlled, long-lasting cold.
Cold helps reduce the perception of pain by slowing the activity of nerve endings.
It helps limit the inflammatory response by moderating the production of its mediators.
It helps limit edema and tissue swelling after trauma.
It narrows the vessels and slows local blood supply.
07Thermoregulation & performance
Beyond treatment, there is managing the body's heat during effort — on the sports field as well as at work.
During exercise, only 20 to 25% of the energy spent becomes mechanical work. The rest? Heat, which the body must shed. As core temperature rises, cardiovascular strain increases: the heart speeds up, blood is rerouted to the skin — and the muscles receive less of it. Fatigue arrives earlier, both muscular and “central”: the nervous system itself eases off.
Limiting heat storage helps keep the skin cooler and reduce thermal discomfort. Sports-science research suggests this can delay the onset of fatigue, support endurance in hot conditions, and help maintain pace or power during prolonged effort.
Start with a thermal reserve: lower the skin's temperature before warming up, to delay the moment the body overheats.
Shed heat continuously, during the effort. This is TEMP‑ERA's strong suit: a flexible pad that integrates into clothing — practical, wearable solutions are rare.
Come back down in temperature fast to kick off recovery — up to 3 h of useful cold, with no ice logistics.
In a worker who is overheating, everything degrades in cascade: core temperature and heart rate climb, sweating and dehydration accelerate, perceived effort increases, alertness and reaction time deteriorate — and the risk of heat-related illness rises.
Maintaining thermal comfort helps reduce physiological strain, supports sustained activity and makes hot environments easier to tolerate, for longer.
08In short
Going further
The mechanisms described on this page — the physiology of heat stress, cooling and endurance, heat management at work — are documented by the field's reference bodies and journals:
General references for the field, cited to situate the mechanisms — they do not constitute clinical validation of the product.
TEMP-ERA™ inside
Email us at hello@temp-era.tech to discuss it. We'll get back to you promptly.
hello@temp-era.tech