Buyer's guide

Cooling Vest Types Compared

Ice, PCM (phase change), evaporative, circulatory, and solid-state cooling vests — how each one works, how long it lasts, what climate it fits, and what it costs per cooling hour.

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Quick comparison

Five cooling vest categories. Different jobs.

Ice vests

60–90 min runtime

Cheapest. Cold fast. Melts fast. Needs freezer support and refill logistics. Best for short tasks with re-freeze access.

PCM

2–3 hr at 58–65°F

Phase change material holds a fixed temperature. More consistent than ice. Still requires re-freezing between shifts.

Evaporative

2–4 hr in dry climate

Lightweight and cheap. Works only when humidity is low. Fails in coastal, refinery, and indoor environments.

Circulatory

3–6 hr w/ reservoir

Battery pumps chilled water around the body. Strong cooling, more bulk, requires ice in the reservoir.

Solid-state

8–12 hr with one battery swap

Thermoelectric cooling. No ice, no water, no humidity dependency. ClemaCore is in this category, sub-2 lbs.

Hybrid

Varies

Some vests combine PCM packs with fans or evaporative liners. Performance depends on conditions and battery.

Choosing for industrial use

Match the vest to the shift, not just the day.

For full-shift industrial work in 120°F+ heat, the key question is not "how cold does it get?" but "how long does it stay cold?" Solid-state and circulatory cooling vests are the only categories that can cover an 8–12 hour shift without re-icing or refilling.

  • ClimateHumid: avoid evaporative. Dry: any category works.
  • PPE-fitWorn under hi-vis or FR? Choose sub-2-lb solid-state.
  • LogisticsNo ice/freezer on site? Skip ice and PCM.
  • Shift length8+ hr? Solid-state with hot-swap batteries.
  • CostCost per cooling hour beats sticker price. Calculate over the gear's lifespan.

FAQ

Cooling vest buyer's FAQ.

How long does a cooling vest last on a shift?
Runtime depends on technology. Ice pack vests last 60–90 minutes before melting. Phase change (PCM) vests hold a constant temperature (typically 58–65°F) for 2–3 hours. Evaporative vests give 2–4 hours per soak in dry climates. Battery-powered circulatory and solid-state vests run 6–12 hours depending on battery capacity. ClemaCore runs 8–12 hours with one battery swap with hot-swap in under a minute.
What is the difference between a PCM cooling vest and an evaporative cooling vest?
PCM (phase change material) vests use packs that melt at a fixed temperature (58–65°F) and hold that temperature until fully melted — typically 2–3 hours. Evaporative vests soak in water and cool by evaporation, working well in dry climates and poorly in humid ones. PCM works in humidity; evaporative is cheaper and lighter.
Which cooling vest works best in high humidity?
Evaporative vests fail in high humidity because the water cannot evaporate efficiently. PCM, battery-powered circulatory, and solid-state cooling vests all continue to function in humid environments. For Gulf Coast refineries, summer warehouses without HVAC, and similar high-humidity environments, choose PCM, circulatory, or solid-state.
What is a battery-powered cooling vest?
Battery-powered cooling vests use one of two approaches: fan-driven airflow inside the vest (faster sweat evaporation) or circulatory tubing pumping chilled water around the body. Solid-state vests use thermoelectric (Peltier) modules powered by battery and are the most compact category — no water reservoir, no ice.
Are cooling vests OSHA-compliant?
OSHA's heat illness prevention guidance lists cooling vests and other PPE as supplemental controls. They support — but do not replace — engineering and administrative controls like shade, hydration, and work-rest cycles. See our OSHA heat standard guide for details on integrating cooling vests into a HIIPP.
How much does a cooling vest cost per cooling hour?
Cost-per-cooling-hour depends on lifespan and runtime, not sticker price. A $50 ice pack vest needing replacement every 12–18 months often costs more per cooling hour than a $180 circulatory vest lasting 3–4 years. Solid-state vests with hot-swap batteries spread cost across the whole shift.
Can workers wear a cooling vest under hi-vis or FR coveralls?
It depends on the vest. Bulky PCM and circulatory vests can interfere with outer PPE. Slim sub-2-lb systems like ClemaCore are designed to fit under hi-vis vests, FR coveralls, fall-arrest harnesses, SCBA, and arc-rated PPE without modification.
What is a solid-state cooling vest?
A solid-state cooling vest uses thermoelectric (Peltier) modules powered by battery to move heat away from the body. There are no moving parts, no ice, no water, and no humidity dependency. Performance is consistent across climates. ClemaCore is a solid-state cooling vest with 8–12 hr runtime with one battery swap and a >25°F felt temperature drop.

Related guides

Keep reading.

OSHA Heat Standard 2026

Triggers, HIIPP, penalties, and PPE fit.

Cooling Vest for Construction

Worn under hi-vis, FR gear, and fall-arrest.

Cooling Vest for Manufacturing

Foundries, steel mills, glass plants.

Summer 2026 — 500-unit first batch

Spec the right cooling vest for your crew.

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