Heat stops your crew. Clema keeps them working.
Full-shift active cooling for industrial crews in 120°F+ heat. No ice. No re-freezing.
>25°F
Felt temperature drop, right at the core.
<3lbs
Flat under hi-vis and a fall-arrest harness.
8–12hr
A full shift with one battery swap.
Zeroice
No water, no freezer, nothing to refill.
Every hot day, you choose: production or safety.
30–50%
Output drop on peak-heat days
What is Clema?
Clema is the active cooling vest for crews who work in real heat.
It’s a battery-powered, solid-state vest made by Clema, Inc. in San Francisco. It cools electrically, on demand and all shift, under PPE: under 3 lbs, no ice or water, a full shift with one battery swap.
- Heat exchangers at the shoulders
- >25°F felt drop at the chest
- Under 3 lbs
We cool every space and physical system, except humans. Until now.
Cooling vests built for the crews that work in real heat.
Above 80°F, your crew slows down.
The hottest days cost crews 30% or more of their output. The map shows how many days your region runs above 80°F, and where heat rules are already law.
Days a year above 80°F
Source: NOAA CPC daily max temperature, 2022 to 2024 average
Heat rules by state and country ShowHide +
7 US states with an enforceable law Show allHide +
California Trigger 80°F out / 82°F in Enforceable Washington Trigger 80°F Enforceable Oregon Trigger 80°F, then 90°F Enforceable Maryland Trigger 80°F, then 90°F Enforceable Nevada Written hazard assessment Enforceable Minnesota 77 to 86°F WBGT Enforceable Colorado Thresholds phasing in Enforceable3 US states on federal OSHA only Show allHide +
Texas Local rules preempted OSHA only Florida Local rules blocked OSHA only Arizona ADOSH emphasis program OSHA only17 countries with binding national rules Show allHide +
Questions crews ask first.
What is Clema?
Clema is the active cooling vest for crews who work in real heat. It’s a battery-powered, solid-state vest made by Clema, Inc. in San Francisco. It cools electrically under PPE: under 3 lbs, no ice or water, a full shift with one battery swap.
How long does Clema run?
4 to 6 hours per battery, and 8 to 12 hours with one battery swap. The swap takes under a minute, so one charged spare covers a full shift.
Does it work in humidity?
Yes. Clema cools by contact, electrically, so humid air doesn’t slow it down the way it stops evaporative and fan vests.
How heavy is it, and does it fit under a harness?
Under 3 lbs. It sits flat under hi-vis and works with a fall-arrest harness.
How much cooler does it feel?
More than 25°F cooler at the body, and it’s tested in 120°F+ conditions.
When can my crew get one?
The first batch sold out. Clema is taking early-access applications for a limited 2027 deployment, with priority for crews with documented heat exposure.
What if temperature was no longer a constraint on work?
Be the crew that never stops for heat again.