Polycool

A little water, good water pressure—that’s cool. PolyCool™ technology relies on ultra-absorbent polymer fibers that trap water in the fabric’s lining and then release it as a cooling effect for hours.

No batteries, no chemicals, no wet skin. Just soak it, wring it out, and put it on. The collection covers the head and torso for extended exposure to the sun.

How is it different from a simple damp piece of fabric? A conventional fabric dries in a few minutes and no longer provides any cooling. The polymer fibers, on the other hand, store water in the lining and release it slowly, for long-lasting coolness.

This collection features cooling products powered by this technology:

• For the head: the adjustable cooling cap, the slim-fit cooling sports cap, the UV-protective cooling hat, and the lightweight cooling beanie.
• For working in the sun: the UV-protective safari cap with neck protection, ideal for long days outdoors.
• For the torso: the cooling vest, its high-visibility reflective version, and the ergonomic sports model.
• For the neck and face: the cooling bandana, the most versatile item in the line.

Need to cover other areas of the body? Explore all the cooling accessories and the complete line of G-Heat cooling apparel

The heat should never force you to go back inside. That’s exactly what this technology is designed to do: hold its own when the temperature soars, without restricting your movement.

It’s based on physics, not magic. The polymer fibers absorb up to 80% of their weight in water, and the slow evaporation lowers the perceived temperature by about 15 °C.

This mechanism is most effective during prolonged exposure to the sun, where heat builds up hour after hour. You’re no longer fighting the heat wave—you’re keeping your body within its comfort zone.

In practical terms, PolyCool™ technology delivers on three promises:

• Continuity: finish your run, hike, or workday without having to stop because of the heat.
• Safety: stay alert and reduce the risk of heat exhaustion during prolonged exposure to the sun.
• Freedom: no longer have to endure the heatwave as an inevitability, and head out fully equipped while others stay indoors.

“The strength of PolyCool™ lies in its simplicity. Plain water, a good wring, and the coolness lasts for several hours. No refills, no chemicals.” — Romane Benderradji, G-Heat team

The right item depends first and foremost on your level of exposure. A cap for a two-hour outing, a vest for a full day in the sun.

Three criteria are all you need to make a decision:

• The area to be protected: The head heats up first—it’s the body’s radiator. A cap, hat, or beanie covers the skull; the vest covers the torso and vital organs.
• The level of sun exposure: standing still in the sun, a long hike, or a short trip. The longer the exposure, the larger the cooling surface area should be.
• Fit and weight: the sport version prioritizes lightness and a snug fit; the safari version adds a neck guard for extended use.

For intense sun exposure, opt for UV-certified models. The comparison of cooling caps helps you choose the right headwear based on your needs.

When it comes to colors, the choice isn’t just about style. Light colors reflect more sunlight and are better suited for long periods of exposure; dark colors remain discreet for city use or work.

If you’re unsure, think about your typical day. Short but repeated exposure calls for a headwear option that activates in seconds; a full day in the sun calls for a vest, which covers a larger area.

Directly from the source. G-Heat has been designing, testing, and validating its thermoregulation devices in the field since 2017.

Buying here means relying on concrete benchmarks:

• A 4.1/5 rating on Trustpilot, continuously verified by our customers.
• Free pickup at a pickup point for purchases of €45 or more in France, shipped within 24 hours.
• 100% secure payment, free exchanges within the European Union, and a 12-month warranty.

“Our PolyCool™ products are designed for the field, not the lab. We test them under real-world conditions before offering them to customers. That’s our standard.” — Gwenaël Fournet, Technical Manager at G-Heat

As soon as the sun is beating down and your activity is in full swing. PolyCool™ technology really shines during prolonged exposure, where heat builds up.

Situations where it makes a real difference, from the most common to the most specific:

1. Sports and outdoor activities: running, cycling, hiking, or trail running in temperatures below 30 °C. You stay cool throughout your workout, so you can see your outing through to the end.
2. S Family outings: the beach, the park, festivals, summer strolls. Easy to activate, perfect for long days outdoors with the kids.
3. Mobility: bike rides or breaks during a motorcycle trip, when the sun beats down whether you’re stopped or moving.
4. Daily life and health: gardening, walking, summer errands. A valuable aid for people sensitive to heat, with no technical hassles.
5. Outdoor work: construction sites, logistics, material handling. The high-visibility version combines cooling and safety in the field.

What all these situations have in common: prolonged sun exposure and an activity you don’t want to interrupt. This is exactly where PolyCool™ shines.

A simple rule: if you’re going to be in the sun for more than an hour, you’ll be glad you soaked it before heading out.

Three steps, thirty seconds. No complicated preparation, no need to plan ahead for recharging.

The activation process by soaking is the same for all PolyCool™ products:

1. Soak the product in clean water until the polymer fibers are fully saturated.
2. Wring it out firmly to remove excess water: the fabric should not drip.
3. Put it on or apply it: slow evaporation ensures long-lasting coolness without wetting your skin.

When the cooling sensation fades, simply reactivate it at the nearest fountain or faucet. The cooling effect kicks in immediately, as many times as needed.

A practical tip to keep in mind: soak the garment before you head out—never once the heat has already set in. This gives you a head start against the heat.

Cold water isn’t necessary. Tap water is enough: it’s evaporation—not the initial temperature—that creates lasting coolness.

Minimal care is all it takes to keep the fibers performing well season after season. PolyCool™ is reusable, as long as you follow a few simple steps.

• Washing: Preferably by hand, or in the washing machine at a maximum of 30 °C with a mild detergent.
• Drying: Air-dry only. Do not tumble dry, bleach, or dry clean.
• Storage: Always store dry. Never store the product while damp to prevent mold.

Be sure to rinse it once before using it for the very first time. When properly cared for, your gear will last all summer without losing its cooling properties.