Ice packs start too cold. Kelvin™ sits in the 10 to 12°C window, and stays there.
Independent thermal testing is underway. Measured figures will be published here when it is complete.
A reusable, fridge-ready cold-therapy pad that holds a gentle, controlled 10 to 12°C, the range used for cold therapy, instead of the 0°C shock of ice. It never freezes solid and never goes sub-zero. Dry, steady, and reusable.
PCMx™ is a phase-change material. It absorbs heat by changing state rather than simply warming up, helping Kelvin™ hold a gentle, controlled temperature through a full cold-therapy session.
Kelvin™ never goes sub-zero, so it is designed to avoid the ice-burn and cold-shock of a frozen pack. The sewn-edge indicator badge shows when it is ready.
Hand-finished sport-grade flex-shell, sealed PCMx™ pods and a sewn-edge indicator badge. Designed in the UK for repeated use.
Ice blue when ready. Fades to white when it is time to recharge.
No fabric, no fleece, no insulating layers between you and the cold. A matte black sport-grade flex-shell holds thirty-five heat-welded PCMx™ pods in a 7 x 5 grid that bends with the body, with a thermochromic readiness badge sewn into the pad edge.
For active days, training sessions and everyday routines, Kelvin™ provides gentle, controlled cooling that fits around the body.
Controlled cooling comfort for knees and joints after long days, workouts or everyday activity.
Fridge-ready cooling for lower back comfort while resting, sitting or winding down.
Flexible cooling that sits comfortably over the joint and can be recharged for another session.
Keep Kelvin™ in the fridge so controlled cooling is ready when you need it.
Sits over the shoulder for steady cooling after tennis, golf, swimming or a gym session.
Steady cooling after runs, training or gym sessions, without the freezing shock of a frozen pack.
Kelvin™ is intended for general cooling comfort. It is not a medical device or a substitute for medical advice. Always follow the instructions for use.
Charge Kelvin™ in your fridge. Overnight is easiest. The readiness badge tells you when it is set.
Strap it to a knee, elbow or lower back with firm, normal pressure.
It holds a gentle, controlled 10 to 12°C for a full cold-therapy session, then you recharge and reuse it. It is not designed to be sat or lain on, which drains it faster.
An ordinary ice or gel pack comes out of the freezer at 0°C or below. That is too cold at the start, it carries an ice-burn risk, and it can trigger the body's cold rebound. As it thaws, it passes through the useful range and keeps warming. It also sweats and drips.
Kelvin™ begins in the cold-therapy window and holds a gentle 10 to 12°C as it slowly warms. It never goes sub-zero, so it is designed to avoid ice-burn and cold shock. Because nothing melts, it stays dry.
It is about where the temperature sits, not how cold it feels at first.
"Standard ice packs shouldn't touch your skin directly."
Because they can be sub-zero. Kelvin™ never goes sub-zero, so it is designed to avoid the ice-burn and cold-shock of a frozen pack when used as directed.
Ready for controlled cooling?
One Kelvin™. Ready when you are. £39.
Cold therapy works by cooling the skin into roughly the 10 to 15°C range, which slows local nerve signalling. In one study, cooling the skin to about 10°C reduced nerve conduction velocity by about a third.
Go colder and there are diminishing returns and rising risks, including ice-burn and the cold rebound first described by Lewis in 1930. Colder is not always better.
Algafly & George, peer-reviewed in the British Journal of Sports Medicine, 2007.
"Cooling skin to about 10°C reduced nerve conduction velocity by about a third."
The benefit comes from holding the useful temperature window. A melting ice pack cannot hold one temperature, while Kelvin™ is designed to settle into a gentle 10 to 12°C as it slowly warms.
Reduction in nerve conduction velocity at about 10°C in Algafly and George (2007).
The approximate skin-temperature range used for cold therapy.
Where frozen gel and ice packs may start, before warming through the useful range.
Gel and ice packs can come out of the freezer at 0°C or below, then warm through the useful range. Kelvin™ uses PCMx™, a phase-change material, to hold a gentle, controlled 10 to 12°C as it slowly warms.
No. Charge Kelvin™ in your fridge; overnight is easiest. The sewn-edge readiness badge shows when it is set.
It never goes sub-zero, so it will not ice-burn the way a frozen pack can. Use it as directed.
Kelvin™ is intended for external cooling on intact skin. Do not use if you have reduced skin sensation, poor circulation, cold sensitivity, nerve damage, or if a clinician has advised you to avoid cold exposure. Speak to a healthcare professional if unsure.
Kelvin™ is designed for supervised cooling sessions while resting or sitting. Do not use while asleep.
It holds the cold-therapy range for a full session. We are having the exact figure measured by an independent laboratory and will publish it here.
Kelvin™ never goes sub-zero, so it is designed to avoid the ice-burn and cold-shock of a frozen pack. Use it as directed.
A sewn-edge thermochromic readiness badge integrated into the pad edge shows when Kelvin™ is ready, then fades when it needs to recharge.
Nothing melts, so there is no dripping or meltwater. The sport-grade flex-shell outer wipes clean and contains thirty-five sealed PCMx™ pods.
Yes. The pods are arranged in a 7 x 5 grid so the pad forms around knees, shoulders, ankles and the lower back without rigid edges.
Yes. Recharge it in the fridge after use. The badge shows when it is ready for another session.
30 days, no questions asked. If Kelvin™ isn't for you, send it back for a full refund.
