Buyer's guide, updated April 2026

How long does a cooling vest last?

60 minutes to 12 hours, depending on technology.

By , CTO, Materials engineer, UC Berkeley / LBNL

Apply for early access Full comparison guide
Clema solid-state active cooling vest, sub-3-lb suspender form factor with 8-12 hour runtime with one battery swap

Runtime at a glance

Cooling vest runtime by type.

Ice / gel pack
60–90 min
PCM (phase change)
2–3 hr
Evaporative
2–4 hr
Circulatory (battery)
3–6 hr
Solid-state. Clema
8–12 hr (one battery swap)

Full comparison

By type: runtime, climate fit, best use.

Cooling vest type Runtime Works in humidity? Best for
Ice / gel pack 60–90 min Yes Short tasks with freezer access on site
PCM (phase change) 2–3 hr Yes Medium-length wear; needs re-freezing between shifts
Evaporative 2–4 hr No Dry-climate outdoor work; not for Gulf Coast or indoor
Circulatory (chilled water) 3–6 hr Yes High-intensity work with ice reservoir support
Solid-state. Clema 8–12 hr (4–6 hr/battery) Yes Full industrial shifts under PPE, no ice, no water

For a full industrial shift

Only solid-state covers 8–12 hours, with one battery swap.

Ice, PCM, and evaporative are built for 1–3 hour windows. For full-shift industrial work in 120°F+ heat, solid-state is the only category with no ice, no water, no humidity dependency, and hot-swap batteries that cover the entire shift.

  • 8 hr+Solid-state or circulatory only.
  • HumidSkip evaporative. PCM, circulatory, solid-state all work.
  • RadiantSkip evaporative + fan-driven. PCM and solid-state work.
  • No iceSkip ice + circulatory. Pick solid-state.
  • Under PPEPick sub-3-lb solid-state.

FAQ

Cooling vest duration: short answers.

How long does a cooling vest last on a shift?
Ice: 60–90 min. PCM: 2–3 hr at 58–65°F. Evaporative: 2–4 hr in dry climates. Circulatory: 3–6 hr. Solid-state (Clema): 8–12 hr with one battery swap, hot-swap in under a minute. In humid climates the ranking changes, because two of these types stop cooling well before their runtime is up.
What is the longest-lasting cooling vest?
Solid-state thermoelectric vests with hot-swap batteries. 8–12 hours with one battery swap, swap in under a minute. Clema is in this category.
Can you wear a cooling vest all day?
Only solid-state vests with hot-swap batteries. Ice and PCM need re-freezing every 60–180 min. Evaporative needs re-soaking every 2–4 hr and fails in humidity.
Which cooling vest works best in high humidity?
Evaporative fails. PCM, circulatory, and solid-state all work regardless of dew point.
How long does an ice vest last?
60–90 minutes per pack. Vest body lasts 12–18 months. Short runtime and daily ice logistics make it the highest-maintenance option.

Related guides

Keep reading.

Full Cooling Vest Comparison

Which type still works at hour eight?

OSHA Heat Standard 2026

What does an inspector actually ask for?

Cooling Vest for Construction

What fails first under a harness?

Summer 2026, 500-unit first batch

The 8–12 hr solid-state cooling vest, on one battery swap.

Apply for early access Talk to the team
Apply for early accessROI calculator