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Guide Thank you for purchasing Undercool!

Visit for more details and how-to videos.

Getting Started

-Place the cooling packs flat in your freezer or fridge -Wait 45-60 minutes for the packs to become fully solid -Slide the frozen cooling packs into each of the pockets in the back of your Undercool Your Undercool is now charged up and ready to be worn.

How to Wear

-Unfasten the velcro -Place your arms through each arm hole -Fasten the velcro on your front, tight enough so that the cooling packs rest on your back firmly

Wear whatever you like over your Undercool.

Cooling and Recharging

-Undercool will cool as long as the packs havent become soft, this may occur in 1-3 hours depending on the conditions -To recharge the packs put them back in the freezer or fridge for 45 to 60 minutes or until they are fully solid again

Enjoy a day safe from the heat!

Washing & Care

-Remove all cooling packs from the vest -Wash Undercool in cold water with like colors -Dry and store flat Share your own Tips & Tricks for staying cool with us via:

Legalese Warranty

One year warranty against any defects in materials and/or workmanship. We will repair or replace, at Thermapparel’s discretion, within that time.

Return & Damages Policy

If for any reason you find a product unsatisfactory, you may return the product in its unused, original condition, including all components and packaging, within 30 days of purchase date as stated on your receipt for a full refund of the amount paid Please contact us if your product is received damaged or defective and we will make it right! If your product is received damaged in shipping, keep all packing materials and report the damage to our Customer Service at 855-232-7233. We will replace your product right away. For the full policy please visit


Consult your health care professional prior to using this or any body cooling product for a medical condition. Undercool cooling packs are designed for the specific objective of cooling the body. Thermapparel LLC will not be liable for injuries or damages resulting from misuse or misapplication of our products.

Questions and/or Comments? Call at 855-232-7233 or email at


Guide for UnderCool. Includes Getting Started Instructions, How to Wear details, Cooling and Recharging Instructions, and Washing and Care G...

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