There are four main factors that will determine how long your cooling packs will last with our vest.

1. What type of packs you have?

We have 2 different versions of our cooling packs that will fit into our UnderCool Vest.

The SlimCool Packs are the original packs. They're really thin and lightweight and will last 1-2 hours.

The ExtendedCool Packs lasts 2-3 hours hours and are only slightly thicker than the SlimCool Packs.

There are some other factors that might make the cooling time go up or down a little bit.

2. What activity are you doing / how hot are you?

The average American body temperature is 97.5 which is actually a little lower than what we think is average, 98.6. This temp can fluctuate depending on hormones, how tall you are, body fat percentage and all sorts of little personal factors.  The main reason it fluctuates is dependent on what activities you're doing.

If you are running you're going to naturally have a higher body temperature because your muscles are working hard, they’re consuming energy and that's creating heat that then needs to leave you body and your core and disperse out into the environment

For instance, if you’re running a triathlon with the SlimCool Packs they are not going to last a full hour, whereas if you are sitting in an air-conditioned room they might last 3+ hours because the packs actually will be recharged if the room you're in is less than 70˚F / 21˚C, even though your body heat is melting the packs.

If you’re running a triathlon with the ExtendedCool Packs they will last about 90 min, whereas if you are sitting in an air-conditioned room they might last 4+ hours because the packs actually will be recharged if the room you're in is less than 70˚F / 21˚C, even though your body heat is melting the packs.

3. How hot is your environment?

To use the same example, if you're running a triathlon and it’s 70 -80˚F / 21- 26˚C, the SlimCool Packs will last about an hour. But if it’s 100˚F / 37˚C the SlimCool Packs will last less than an hour.

if you're running a triathlon and it’s 70 -80˚F / 21- 26˚C, the ExtendedCool Packs will last about an 90 min. But if it’s 100˚F / 37˚C the ExtendedCool Packs will last about an hour.

Also take into account the humidity of the environment. In a humid environment our bodies don't work as well at cooling themselves because your sweating ability doesn't work as well. In a much more drier less humid environment you need to make sure you drink more water because you are sweating, but you don't feel wet because your sweat is evaporating. Its much easier for your body to deal with a hot dry environment to cool itself than a hot humid environment.

4. How do you store / transport you packs?

The two main ways you can store your packs are in your freezer or fridge. if you store them in the freezer you will generally get an extra 10 to 15 minutes of cooling time out of your packs than if you store them in the fridge.

That’s a good thing, but the downside is when you put your vest on right out of the freezer it's going to be really cold for that first 10 minutes. You’ll get that little cringe, super ice cold feeling until it acclimates to your body temp.

We have many customers that don't put their vest on right out of the freezer or fridge and take it with them to the golf course or to the baseball game and put it on when they get there so  they get extra time out of their vest.

If you have  the UnderCool Cooling Vest sitting next to you in the car it's going to melt a little bit right and you will loose some cooling time. But if you put it in a cooler bag and take it with you the vest will have its full charge when you get it there and need to use it.


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ThermApparel is a small business making big waves in the heat sensitivity world by designing the first lightweight, comfortable and invisible cooling vest, UnderCool. Check us out online, on our blog, or on FacebookTwitter, PinterestLinkedIn and Instagram.

Please let us know if you have any other questions or ideas in the comments below, we will follow up. You can always reach us via:
Live Chat - www.thermapparel.com  |  Email - contact.us@thermapparel.net  | Phone - 855-232-7233 |  Address: ThermApparel LLC. 125 Tech Park Dr. Rochester, NY 14620


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