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Person in a laboratory setting with text about circulating water cooling systems on a blue background

Circulating Water Cooling Systems

Some environments don't leave room for compromise. Whether you're in a surgical suite, on a hazmat crew, working a sweltering industrial floor, or managing a heat-sensitive medical condition, you need cooling that works continuously — not for an hour, not until the packs warm up, but for as long as you need it.

Cool Flow® circulating water cooling is that solution.

An open Cool Flow® fitted circulating cooling vest showing the sewn-in light blue tubing in side the vest on a white background.

How It Works

The Cool Flow® System circulates ice-chilled water from an insulated cooler reservoir through a network of tubing sewn directly into the interior of a lightweight cooling vest. As long as there's ice in the cooler, you stay reliably cool.

The technology traces its roots to NASA's work in the 1960s, when engineers needed to keep astronauts cool during spacewalks in the extreme thermal environment of space. Polar Products adapted that same liquid-cooling approach for real-world use, and Cool Flow® Systems have been trusted by militaries, hospitals, industrial operations, and research institutions around the world ever since.

This isn't passive cooling. It isn't evaporative cooling that depends on airflow or humidity. Circulating water cooling actively pulls heat away from your body — continuously.

Woman standing in a factory with a cool flow® circulating cooling system with a fitted cool flow® circulating cooling vest, surrounded by industrial equipment.

Continuous cooling, not time-limited cooling.

Unlike phase-change or ice pack vests that rely on a fixed cooling capacity and warm up over time, the Cool Flow® System keeps circulating chilled water as long as ice remains in the cooler. Resupply is as simple as adding more ice.

Works in any environment.
Heat, humidity, heavy protective gear — none of it defeats a circulating water system. Cool Flow® Vests have been worn under lead aprons, air filtration suits, firefighting gear, military protective clothing, and surgical gowns. The cooling is internal and isolated from ambient conditions.

Tubing sewn inside the vest.
All Cool Flow® Vests are built with the cooling tubing sewn directly into the garment interior, so the cooling surface stays in contact with your body — not exposed to warm outside air.

Scalable to your operation.
Running a team? Cool Flow® is available in multi-person configurations, allowing a single cooler unit to circulate chilled water to multiple vests simultaneously. Custom systems are available for specialized applications.

Man in green scrubs holding open his cool flow® adjustable circulating cooling vest, exposing the tubing that's sewn-in, in a hospital corridor.

Who Relies on Cool Flow®

Circulating water cooling is the right tool when sustained, high-performance cooling is non-negotiable:

  • Surgeons and OR staff wearing lead aprons or standing under surgical lights for hours
  • Industrial and construction workers in hot, enclosed, or high-PPE environments where evaporative cooling can't keep pace
  • Military and government personnel operating in extreme climates or heavy protective gear
  • People managing heat-sensitive medical conditions — including multiple sclerosis, hypohidrosis, and spinal cord injuries — who need continuous cooling that pack systems can't match
  • Emergency first responders and hazmat teams working in full protective gear where ambient cooling is impossible
  • Multi-person operations where a team needs simultaneous, sustained cooling in heat-stress conditions

Types of Circulating Water Cooling & Accessories

Learn more about the type of circulating water cooling we offer.

Woman in a pink shirt holding open an adjustable circulating cooling vest in a laundromat setting.
Personal Cooling Vest Systems

Continuous active cooling that works as long as you need it — no pack swaps, no warm-up, no stopping.
Person in surgical attire wearing an adjustable circulating cooling vest with a 13-quart cool flow or® cooling system in a cart standing in an operating room.
Surgeon Cooling Vest Systems

Hours on your feet under surgical lights generates real heat stress. Cool Flow OR® cooling vest systems keep surgeons and OR staff cool, focused, and comfortable from first incision to close.
Person reading a book with a face cold therapy system attached, sitting on a couch in a living room.
Cooling Head Caps

Head & Face Cold Therapy Systems are built specifically for head, face, and scalp pain relief. The Face pad uses a mask-style design while the Head Cap pad covers the head, face, and scalp for broader coverage.
Man sitting on a couch with Active Ice® Extremity Cooling System on his hands and feet in a living room.
Extremities Cooling

Extremities Cooling System provides active cold therapy to all of your extremities at the same time by circulating cold water through therapy pads for your hands and feet.
A coiled blue hose with white plastic connector fittings on both ends, shown on a plain white background.
Cool Flow® Accessories

Replacement parts and add-ons for Cool Flow® and Cool Flow OR® circulating water cooling systems. Keep your system running at peak performance with genuine Polar Products accessories.