We had a blast at the Midwest FurFest 2022!! Thank you to all the Fur's that stopped to talk to us and purchased a ThermApparel UnderCool Cooling Vest in the Dealer's Den and attended our talk on How To Keep Cool in Your Fursuit. 

What is Midwest FurFest? It's an annual convention in Rosemont, Illinois, founded with two basic purposes: to provide the Furry community with a place to educate themselves in the arts of anthropomorphic literature, art, and performance; and to facilitate fundraising and donations to non-profit organizations that promote the wellbeing of humans and/or animals.

Many of the 15,547 attendees dress in Fursuits and as a result, experience overheating. We were able to help many of those Fur's keep their cool. 

Did you know that the human body has a Heat Stress Threshold of 85˚F / 30˚C?  Above that our bodies can no longer dissipate the heat fast enough to keep our core temps stable and doing pretty much anything becomes more difficult. When temps reach 95˚F / 35˚C our work output drops by 45%.

Our own body is a huge source of heat. As your body produces energy to make your body work the by-product is heat. 

But when we put ourselves in clothing it traps all the excess heat with no way to escape creating sweat that makes a high-humidity environment

What that means for Furry's is that if your Fursuit does not allow your sweat to evaporate it's going to make you hotter every time 

And with the way that many of the Fursuits are made they can trap even more internal heat. 

So the math would tell us that your body is sitting in 98.6˚F /  37˚C temperature and as you sweat the humidity inside your Fursuit goes from 20% to 40% to 100%

At 100% humidity, there is no possibility of evaporation.

Remember - no evaporation = no cooling

The human body is like a fine-tuned machine that needs to operate within a specific temperature range for optimal performance

It's like a Goldilocks situation, not too hot, not too cold, but just right! 

Anything outside of the 92˚F to 104˚F / 33˚C to 40˚C range can lead to some wonky or dangerous symptoms.

at 80F heart and lungs cease to operate. 

at 109F the brain shuts down. 

So, if you feel like you're baking in the Sahara or freezing like a snowman, it's best to seek some help to get your body back to its normal temperature.

Your Fursuit is a huge source of Internal Heat Generation and without proper cooling you can quickly overheat and reach Hyperthermia. Check out these thermal images of Fursuiters and how hot they really are in their Fursuit!

This Fursuiter is experiencing temps of 105˚F / 40.5˚C!!!


This was taken right after a Fursuiter took off their head. The head is radiating 92.4F / 33C heat into the Fursuiter!!

What sizes do you have?

We have 5 sizes - XXS - XXL. Check our sizing page for all sizing info and a video explaining how to get the correct fit.

  • Sizing is based on your natural waist, not your hips or pant size. 
  • You will a smaller size than you think.
  • UnderCool needs to fit your body like a glove to give you the best cooling support. 
  • If you fall in between the 2 sizes order the larger size.
  • If you need help with sizing give us a call 855-232-7233. We are happy to help.

How do I order a cooling vest?

  • Go to our shop page, select your size and cooling pack type, enter your address and credit card info and we will ship it to you.
  • If you need help placing an order give us a call at 855-232-7233. We are happy to take phone orders.

How do ThermApparel Cooling Vests keep me cool under my Fursuit?

Our cooling vest is a PCM Cooling Vest, not gel or ice. PCM works better than gel and ice. Why is that and why is it important?

  • When your body is hot your blood vessels open up to allow heat to be released. In other words, you sweat and when the air hits your sweat it cools your body down.
  • Ice and Gel Packs cause blood vessels to constrict, preventing cooled blood from reaching your core. Ice is wonderful for cooling down a specific part of your body or bringing down swelling, but it doesn't cool your entire body. There is a reason doctors say 20 min on and 20 min off with ice packs. You need your blood vessels to open back up to allow the blood to start flowing again.
  • ThermApparel PCM Cooling Packs cools the blood without constricting your blood vessels. As your blood flows past the PCM Cooling Packs they cool your blood and your body keeps pumping cool blood through your system keeping your whole body cool.

Will it be comfortable while seated?

  • YES! Pilots and race car drivers have worn our product with great results. It's so comfortable, most people forget they have it on.

Can I dance in it?

Yes! Dance, shimmy shake your groove thang. ThermApparel Cooling Vest's move with you. 

Will it interfere with the sizing of my Fursuit?

Because our cooling packs are in the lower back area and are worn directly against the skin the low profile design won't cause you to need a larger size than you normally wear.

Will anyone know I am wearing it?

Unless you are wearing something super skin tight... as Julia's grandmother would say "That's so tight you couldn't hide a peanut in that dress." Nope. UnderCool has a velcro closure in front and with it's low profile design it won't add any bulk to your costume. The cooling packs are in the back so no one will notice.

How long will it keep me cool?

UnderCool will last for 90 min to 3 hours depending on your choice of pack. If you are wearing a full Fursuit, Plush Suit, Poodle Suit, or Partial suit we highly recommend the ExtendedCool Packs. SlimCool isn't going to last long enough for you

SlimCool Packs last 45 in - 1 hour.
ExtendedCool Packs last 2-3 hours.

If you need it to last longer the packs can be refrozen and placed back in the vest, or you can purchase additional cooling packs and swap them when needed. 

The cooling packs can be doubled up in the vest to make them last longer, but this will add a little more weight and bulk to the vest on your back.

The unique thing about our packs is their recharging time and ability. Check out our tech.

  • ice water in 20 min
  • freezer in 40 min
  • fridge in 60 min

The frozen cooling packs can be placed in an insulated cooler and they will stay cold for a few hours until you need to switch. 

What Bundle do you recommend?

We have 3 different bundles for you to choose from. It is the same vest garment and the same cooling packs in each. They are bundled so you get a discount on extra cooling packs and vest garments.

We recommend going with the Adventure Bundle. It comes with 2 Vest Garments and 2 sets of Cooling Packs. This way you still have the flexibility of rotating through the Cooling Packs and you have a clean backup garment for the next round of fursuiting.

  • UnderCool Bundle- 1 Vest Garment - 1 Set of Cooling Packs
  • Festival Bundle- 1 Vest Garment - 2 Sets of Cooling Packs
  • Adventure Bundle - 2 Vest Garments - 2 Sets of Cooling Packs


Do you sell cooling vests for Santa's?

Yes! Check out our Santa Page for more info.

Psst, Hey Santa...