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Palm cooling forathletic performance

Cool your palms for 1–3 minutes between sets. Muscles shed heat, fatigue is delayed, get more reps in the same workout.

Shop Cryo-1 · $139
A man resting on a gym bench holding his Cryo-1 device
“I cool my palms between rounds and my last set finally looks like my first. I'm getting real work in at the end of a session instead of just surviving it.”

Nicole W. · verified customer

up to 25% more endurance

measured in palm cooling studies

4.66 · based on 183 reviews
An athlete resting between sets holding her Cryo-1 device
“Best option under $1k. I can squeeze a few more reps out where I couldn't before.”
Amone C. · verified customer
Shop Cryo-1
Why it works

You're not weak. You're overheating.

The problem

Heat stops you before strength does

Strength athletes rarely fail because the muscle ran out. They fail because the muscle got too hot. Heat pulls the brakes on output long before you run out of strength.

The physiology

Why you fade in later sets

  • Every set burns fuel and produces heat
  • Heat builds faster than your body can clear it
  • Muscles fatigue and each set gets harder
What cooling does

Palm cooling delays fatigue

Hold the cold surface in a relaxed palm during your normal rest period. Your body sheds heat through the blood vessels in your palm, so output stays higher when it usually fades. Pro athletes in the NBA, NHL, MMA and NFL use palm cooling.

  • More reps in later sets
  • Faster recovery between sessions
  • No ice, no water, no setup
A man resting on a gym bench holding his Cryo-1 device

hear from our customers

Reviews ofCryo-1

Alex J.  Alex J. 
“I’ve been using cryo after long runs, and it lets me push further without overheating.”

ENDURANCE RUNNING

C Cal J. 
“This makes a difference between being completely cooked on my heavy sets or being able to push for more reps or a personal best. It's not a massive difference, but it's measurable.”

HEAVY SQUATS

B Braden T.
“Using cryo between bench sets helps me fight fatigue and get more reps, especially in sets 3, 4, and 5.”

WEIGHT TRAINING

D Dani G. 
“What changes is the overheated, foggy feeling. I start the next match clearer.”

MATCH PERFORMANCE

Peer reviewed science

What the research shows

Palm cooling has been studied in athletes and lab settings for two decades. Here is what the research found.

Cryo-1 in a gym setting
Grahn et al., 2005

Palm cooling extends endurance in heat

In treadmill trials at 40°C, palm cooling alone extended exercise duration by about 15% compared to no cooling. Participants kept walking on an incline several minutes longer before exhaustion.

Illustration of the body's heat regulation
Grahn et al., 2012

Palm cooling increases training volume

Over a 10-week resistance program, people who cooled their palms between sets completed 40% more bench press work than controls. Pull-up volume grew 144% and one-rep max rose 22%.

A gym bag packed with a Cryo-1 device
Dip study (2021)

103 dips became 198 dips

An NFL tight end completed 103 dips across five sets without cooling. With cooling between sets, the same session produced 198 dips. After four weeks of training with cooling he reached 310 dips per workout.

Want the full physiology? Read the science.

performance note

Designed for controlled conditions—not extreme heat

Cryo-1 relies on the surrounding air to cool effectively. For best performance, use it indoors or in moderate ambient conditions. Above 80°F, cooling performance and duration can decline significantly, and maximum performance should not be expected.
Ready when you are

Get more out of every session.

Free shipping · 15-night trial · 1-year warranty · FSA/HSA eligible

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Cryo-1 handheld cooling and warming device